28197964 has 12 divisors (see below), whose sum is σ = 49552888. Its totient is φ = 14040000.

The previous prime is 28197943. The next prime is 28197971. The reversal of 28197964 is 46979182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13662 + ... + 15589.

Almost surely, 2^28197964 is an apocalyptic number.

It is an amenable number.

28197964 is a deficient number, since it is larger than the sum of its proper divisors (21354924).

28197964 is a wasteful number, since it uses less digits than its factorization.

28197964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29496 (or 29494 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The square root of 28197964 is about 5310.1755149901. The cubic root of 28197964 is about 304.3728544895.

It can be divided in two parts, 28197 and 964, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 28197964 in words is "twenty-eight million, one hundred ninety-seven thousand, nine hundred sixty-four".