28745986 has 4 divisors (see below), whose sum is σ = 43118982. Its totient is φ = 14372992.

The previous prime is 28745953. The next prime is 28745987. The reversal of 28745986 is 68954782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22268961 + 6477025 = 4719^2 + 2545^2 .

It is a super-2 number, since 2×28745986² = 1652663422224392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28745987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7186495 + ... + 7186498.

Almost surely, 2^28745986 is an apocalyptic number.

28745986 is a deficient number, since it is larger than the sum of its proper divisors (14372996).

28745986 is a wasteful number, since it uses less digits than its factorization.

28745986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14372995.

The product of its digits is 967680, while the sum is 49.

The square root of 28745986 is about 5361.5283268859. The cubic root of 28745986 is about 306.3320260082.

The spelling of 28745986 in words is "twenty-eight million, seven hundred forty-five thousand, nine hundred eighty-six".