28677621 has 16 divisors (see below), whose sum is σ = 43849728. Its totient is φ = 16330800.

The previous prime is 28677601. The next prime is 28677653. The reversal of 28677621 is 12677682.

It is not a de Polignac number, because 28677621 - 2⁶ = 28677557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28677621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28677601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4336 + ... + 8726.

It is an arithmetic number, because the mean of its divisors is an integer number (2740608).

Almost surely, 2^28677621 is an apocalyptic number.

28677621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28677621 is a deficient number, since it is larger than the sum of its proper divisors (15172107).

28677621 is a wasteful number, since it uses less digits than its factorization.

28677621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4712.

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

The square root of 28677621 is about 5355.1490175344. The cubic root of 28677621 is about 306.0889890270.

The spelling of 28677621 in words is "twenty-eight million, six hundred seventy-seven thousand, six hundred twenty-one".