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28915749 = 323212861
BaseRepresentation
bin110111001001…
…1100000100101
32000102001221200
41232103200211
524400300444
62511433113
7500531322
oct156234045
960361850
1028915749
111535a915
129825799
135cb5615
143ba9b49
152812969
hex1b93825

28915749 has 6 divisors (see below), whose sum is σ = 41767206. Its totient is φ = 19277160.

The previous prime is 28915729. The next prime is 28915751. The reversal of 28915749 is 94751982.

It can be written as a sum of positive squares in only one way, i.e., 26936100 + 1979649 = 5190^2 + 1407^2 .

It is not a de Polignac number, because 28915749 - 211 = 28913701 is a prime.

It is a super-2 number, since 2×289157492 = 1672241080462002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28915729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1606422 + ... + 1606439.

It is an arithmetic number, because the mean of its divisors is an integer number (6961201).

Almost surely, 228915749 is an apocalyptic number.

It is an amenable number.

28915749 is a deficient number, since it is larger than the sum of its proper divisors (12851457).

28915749 is a wasteful number, since it uses less digits than its factorization.

28915749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3212867 (or 3212864 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 28915749 is about 5377.3366083964. The cubic root of 28915749 is about 306.9338701122.

The spelling of 28915749 in words is "twenty-eight million, nine hundred fifteen thousand, seven hundred forty-nine".

Divisors: 1 3 9 3212861 9638583 28915749