28915986 has 32 divisors (see below), whose sum is σ = 66412800. Its totient is φ = 8300880.

The previous prime is 28915979. The next prime is 28915993. The reversal of 28915986 is 68951982.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28915979) and next prime (28915993).

It is a super-2 number, since 2×28915986² = 1672268492704392, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10276 + ... + 12783.

It is an arithmetic number, because the mean of its divisors is an integer number (2075400).

Almost surely, 2^28915986 is an apocalyptic number.

28915986 is an abundant number, since it is smaller than the sum of its proper divisors (37496814).

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

28915986 is a wasteful number, since it uses less digits than its factorization.

28915986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23094.

The product of its digits is 311040, while the sum is 48.

The square root of 28915986 is about 5377.3586452830. The cubic root of 28915986 is about 306.9347086763.

The spelling of 28915986 in words is "twenty-eight million, nine hundred fifteen thousand, nine hundred eighty-six".