28781464 has 16 divisors (see below), whose sum is σ = 56311920. Its totient is φ = 13764960.

The previous prime is 28781453. The next prime is 28781471. The reversal of 28781464 is 46418782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78027 + ... + 78394.

It is an arithmetic number, because the mean of its divisors is an integer number (3519495).

Almost surely, 2^28781464 is an apocalyptic number.

It is an amenable number.

28781464 is a deficient number, since it is larger than the sum of its proper divisors (27530456).

28781464 is a wasteful number, since it uses less digits than its factorization.

28781464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156450 (or 156446 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 28781464 is about 5364.8358781980. The cubic root of 28781464 is about 306.4579981422.

The spelling of 28781464 in words is "twenty-eight million, seven hundred eighty-one thousand, four hundred sixty-four".