28990402 has 16 divisors (see below), whose sum is σ = 49795200. Its totient is φ = 12400128.

The previous prime is 28990387. The next prime is 28990421. The reversal of 28990402 is 20409982.

28990402 = 1004² + 1005² + ... + 1031².

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, 6658 + ... + 10114.

It is an arithmetic number, because the mean of its divisors is an integer number (3112200).

Almost surely, 2^28990402 is an apocalyptic number.

28990402 is a deficient number, since it is larger than the sum of its proper divisors (20804798).

28990402 is a wasteful number, since it uses less digits than its factorization.

28990402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4065.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 28990402 is about 5384.2735814592. The cubic root of 28990402 is about 307.1977844644.

It can be divided in two parts, 28990 and 402, that added together give a palindrome (29392).

The spelling of 28990402 in words is "twenty-eight million, nine hundred ninety thousand, four hundred two".