28523902 has 16 divisors (see below), whose sum is σ = 49132800. Its totient is φ = 12282840.

The previous prime is 28523899. The next prime is 28523903. The reversal of 28523902 is 20932582.

It is a super-2 number, since 2×28523902² = 1627225970611208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28523903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33702 + ... + 34537.

It is an arithmetic number, because the mean of its divisors is an integer number (3070800).

Almost surely, 2^28523902 is an apocalyptic number.

28523902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28523902 is a deficient number, since it is larger than the sum of its proper divisors (20608898).

28523902 is a wasteful number, since it uses less digits than its factorization.

28523902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68271.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28523902 is about 5340.7772842537. Note that the first 3 decimals coincide. The cubic root of 28523902 is about 305.5411052021.

The spelling of 28523902 in words is "twenty-eight million, five hundred twenty-three thousand, nine hundred two".