102638728 has 8 divisors (see below), whose sum is σ = 192447630. Its totient is φ = 51319360.

The previous prime is 102638699. The next prime is 102638729. The reversal of 102638728 is 827836201.

It can be written as a sum of positive squares in only one way, i.e., 101969604 + 669124 = 10098^2 + 818^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (102638729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6414913 + ... + 6414928.

Almost surely, 2^102638728 is an apocalyptic number.

It is an amenable number.

102638728 is a deficient number, since it is larger than the sum of its proper divisors (89808902).

102638728 is a wasteful number, since it uses less digits than its factorization.

102638728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12829847 (or 12829843 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 102638728 is about 10131.0773365916. The cubic root of 102638728 is about 468.2061210051.

The spelling of 102638728 in words is "one hundred two million, six hundred thirty-eight thousand, seven hundred twenty-eight".