28572621 has 32 divisors (see below), whose sum is σ = 48795648. Its totient is φ = 14437440.

The previous prime is 28572617. The next prime is 28572623. The reversal of 28572621 is 12627582.

It is not a de Polignac number, because 28572621 - 2² = 28572617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28572623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6876 + ... + 10218.

It is an arithmetic number, because the mean of its divisors is an integer number (1524864).

Almost surely, 2^28572621 is an apocalyptic number.

28572621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28572621 is a deficient number, since it is larger than the sum of its proper divisors (20223027).

28572621 is a wasteful number, since it uses less digits than its factorization.

28572621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401.

The product of its digits is 13440, while the sum is 33.

The square root of 28572621 is about 5345.3363785640. The cubic root of 28572621 is about 305.7149616192.

The spelling of 28572621 in words is "twenty-eight million, five hundred seventy-two thousand, six hundred twenty-one".