28687464 has 48 divisors (see below), whose sum is σ = 83674500. Its totient is φ = 8826624.

The previous prime is 28687447. The next prime is 28687481. The reversal of 28687464 is 46478682.

It is an interprime number because it is at equal distance from previous prime (28687447) and next prime (28687481).

It can be written as a sum of positive squares in 2 ways, for example, as 21622500 + 7064964 = 4650^2 + 2658^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14389 + ... + 16260.

Almost surely, 2^28687464 is an apocalyptic number.

28687464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28687464 is an abundant number, since it is smaller than the sum of its proper divisors (54987036).

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

28687464 is a wasteful number, since it uses less digits than its factorization.

28687464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30674 (or 30667 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 28687464 is about 5356.0679607339. The cubic root of 28687464 is about 306.1240045918.

The spelling of 28687464 in words is "twenty-eight million, six hundred eighty-seven thousand, four hundred sixty-four".