28100916 has 36 divisors (see below), whose sum is σ = 71199492. Its totient is φ = 9345024.

The previous prime is 28100893. The next prime is 28100921. The reversal of 28100916 is 61900182.

It can be written as a sum of positive squares in 2 ways, for example, as 26010000 + 2090916 = 5100^2 + 1446^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×28100916² = 1579322960078112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28100916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23796 + ... + 24948.

Almost surely, 2^28100916 is an apocalyptic number.

It is an amenable number.

28100916 is an abundant number, since it is smaller than the sum of its proper divisors (43098576).

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

28100916 is a wasteful number, since it uses less digits than its factorization.

28100916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840 (or 1835 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 28100916 is about 5301.0297112919. The cubic root of 28100916 is about 304.0232698023.

The spelling of 28100916 in words is "twenty-eight million, one hundred thousand, nine hundred sixteen".