28815951 has 16 divisors (see below), whose sum is σ = 40745600. Its totient is φ = 18063648.

The previous prime is 28815949. The next prime is 28815967. The reversal of 28815951 is 15951882.

It is not a de Polignac number, because 28815951 - 2¹ = 28815949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28815931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6105 + ... + 9741.

It is an arithmetic number, because the mean of its divisors is an integer number (2546600).

Almost surely, 2^28815951 is an apocalyptic number.

28815951 is a deficient number, since it is larger than the sum of its proper divisors (11929649).

28815951 is a wasteful number, since it uses less digits than its factorization.

28815951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3798.

The product of its digits is 28800, while the sum is 39.

The square root of 28815951 is about 5368.0490869589. The cubic root of 28815951 is about 306.5803523361.

The spelling of 28815951 in words is "twenty-eight million, eight hundred fifteen thousand, nine hundred fifty-one".