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28912129 = 1922832
BaseRepresentation
bin110111001001…
…0101000000001
32000101212222121
41232102220001
524400142004
62511404241
7500514631
oct156225001
960355877
1028912129
1115358124
129823681
135cb3a8c
143ba86c1
152811854
hex1b92a01

28912129 has 9 divisors (see below), whose sum is σ = 30622113. Its totient is φ = 27293652.

The previous prime is 28912099. The next prime is 28912151. The reversal of 28912129 is 92121982.

The square root of 28912129 is 5377.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 28912129 - 27 = 28912001 is a prime.

It is a super-2 number, since 2×289121292 = 1671822406625282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28912094 and 28912103.

It is not an unprimeable number, because it can be changed into a prime (28912729) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 102022 + ... + 102304.

It is an arithmetic number, because the mean of its divisors is an integer number (3402457).

Almost surely, 228912129 is an apocalyptic number.

28912129 is the 5377-th square number.

28912129 is the 2689-th centered octagonal number.

It is an amenable number.

28912129 is a deficient number, since it is larger than the sum of its proper divisors (1709984).

28912129 is an frugal number, since it uses more digits than its factorization.

28912129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 302 counting only the distinct ones).

The product of its digits is 5184, while the sum is 34.

The cubic root of 28912129 is about 306.9210610950.

Multiplying 28912129 by its product of digits (5184), we get a square (149880476736 = 3871442).

The spelling of 28912129 in words is "twenty-eight million, nine hundred twelve thousand, one hundred twenty-nine".