Search a number
-
+
28038972 = 22313179737
BaseRepresentation
bin110101011110…
…1011100111100
31221202112020110
41222331130330
524134221342
62440550020
7460220163
oct152753474
957675213
1028038972
1114911105
129482310
135a69510
143a1c3da
1526dcc9c
hex1abd73c

28038972 has 24 divisors (see below), whose sum is σ = 70457296. Its totient is φ = 8627328.

The previous prime is 28038971. The next prime is 28038979. The reversal of 28038972 is 27983082.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 28038972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28038971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89713 + ... + 90024.

Almost surely, 228038972 is an apocalyptic number.

It is an amenable number.

28038972 is an abundant number, since it is smaller than the sum of its proper divisors (42418324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28038972 is a wasteful number, since it uses less digits than its factorization.

28038972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179757 (or 179755 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 28038972 is about 5295.1838494995. The cubic root of 28038972 is about 303.7997151433.

The spelling of 28038972 in words is "twenty-eight million, thirty-eight thousand, nine hundred seventy-two".

Divisors: 1 2 3 4 6 12 13 26 39 52 78 156 179737 359474 539211 718948 1078422 2156844 2336581 4673162 7009743 9346324 14019486 28038972