28628889015 has 64 divisors (see below), whose sum is σ = 50655476736. Its totient is φ = 13733271552.

The previous prime is 28628889011. The next prime is 28628889089. The reversal of 28628889015 is 51098882682.

It is not a de Polignac number, because 28628889015 - 2² = 28628889011 is a prime.

It is a super-2 number, since 2×28628889015² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28628889011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11746377 + ... + 11748813.

It is an arithmetic number, because the mean of its divisors is an integer number (791491824).

Almost surely, 2^28628889015 is an apocalyptic number.

28628889015 is a deficient number, since it is larger than the sum of its proper divisors (22026587721).

28628889015 is a wasteful number, since it uses less digits than its factorization.

28628889015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4488.

The product of its (nonzero) digits is 4423680, while the sum is 57.

The spelling of 28628889015 in words is "twenty-eight billion, six hundred twenty-eight million, eight hundred eighty-nine thousand, fifteen".