28971916 has 6 divisors (see below), whose sum is σ = 50700860. Its totient is φ = 14485956.

The previous prime is 28971857. The next prime is 28971923. The reversal of 28971916 is 61917982.

It is a super-2 number, since 2×28971916² = 1678743833422112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3621486 + ... + 3621493.

Almost surely, 2^28971916 is an apocalyptic number.

It is an amenable number.

28971916 is a deficient number, since it is larger than the sum of its proper divisors (21728944).

28971916 is a wasteful number, since it uses less digits than its factorization.

28971916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7242983 (or 7242981 counting only the distinct ones).

The product of its digits is 54432, while the sum is 43.

The square root of 28971916 is about 5382.5566415970. The cubic root of 28971916 is about 307.1324747373.

The spelling of 28971916 in words is "twenty-eight million, nine hundred seventy-one thousand, nine hundred sixteen".