28621776 has 40 divisors (see below), whose sum is σ = 74173824. Its totient is φ = 9510400.

The previous prime is 28621763. The next prime is 28621783. The reversal of 28621776 is 67712682.

It is a super-2 number, since 2×28621776² = 1638412122788352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18505 + ... + 19991.

Almost surely, 2^28621776 is an apocalyptic number.

It is an amenable number.

28621776 is an abundant number, since it is smaller than the sum of its proper divisors (45552048).

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

28621776 is a wasteful number, since it uses less digits than its factorization.

28621776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899 (or 1893 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 28621776 is about 5349.9323360207. The cubic root of 28621776 is about 305.8901737529.

The spelling of 28621776 in words is "twenty-eight million, six hundred twenty-one thousand, seven hundred seventy-six".