28988986 has 32 divisors (see below), whose sum is σ = 48399120. Its totient is φ = 12939264.

The previous prime is 28988977. The next prime is 28989007. The reversal of 28988986 is 68988982.

It can be written as a sum of positive squares in 8 ways, for example, as 11189025 + 17799961 = 3345^2 + 4219^2 .

It is a super-2 number, since 2×28988986² = 1680722618616392, 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 28988986.

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, 150106 + ... + 150298.

Almost surely, 2^28988986 is an apocalyptic number.

28988986 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28988986 is a deficient number, since it is larger than the sum of its proper divisors (19410134).

28988986 is a wasteful number, since it uses less digits than its factorization.

28988986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370.

The product of its digits is 3981312, while the sum is 58.

The square root of 28988986 is about 5384.1420857923. The cubic root of 28988986 is about 307.1927828188.

The spelling of 28988986 in words is "twenty-eight million, nine hundred eighty-eight thousand, nine hundred eighty-six".