28621490 has 32 divisors (see below), whose sum is σ = 52920000. Its totient is φ = 11141568.

The previous prime is 28621469. The next prime is 28621493. The reversal of 28621490 is 9412682.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28621493) 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, 81836 + ... + 82184.

It is an arithmetic number, because the mean of its divisors is an integer number (1653750).

Almost surely, 2^28621490 is an apocalyptic number.

28621490 is a deficient number, since it is larger than the sum of its proper divisors (24298510).

28621490 is a wasteful number, since it uses less digits than its factorization.

28621490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28621490 is about 5349.9056066439. The cubic root of 28621490 is about 305.8891548914.

The spelling of 28621490 in words is "twenty-eight million, six hundred twenty-one thousand, four hundred ninety".