28815764 has 6 divisors (see below), whose sum is σ = 50427594. Its totient is φ = 14407880.

The previous prime is 28815737. The next prime is 28815767. The reversal of 28815764 is 46751882.

It can be written as a sum of positive squares in only one way, i.e., 23931664 + 4884100 = 4892^2 + 2210^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28815767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3601967 + ... + 3601974.

It is an arithmetic number, because the mean of its divisors is an integer number (8404599).

Almost surely, 2^28815764 is an apocalyptic number.

It is an amenable number.

28815764 is a deficient number, since it is larger than the sum of its proper divisors (21611830).

28815764 is a wasteful number, since it uses less digits than its factorization.

28815764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7203945 (or 7203943 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 28815764 is about 5368.0316690571. The cubic root of 28815764 is about 306.5796891542.

The spelling of 28815764 in words is "twenty-eight million, eight hundred fifteen thousand, seven hundred sixty-four".