28479990 has 64 divisors (see below), whose sum is σ = 85224960. Its totient is φ = 5917440.

The previous prime is 28479989. The next prime is 28479991. The reversal of 28479990 is 9997482.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28479989) and next prime (28479991).

It is a super-2 number, since 2×28479990² = 1622219660800200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28479991) 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, 3855 + ... + 8474.

It is an arithmetic number, because the mean of its divisors is an integer number (1331640).

Almost surely, 2^28479990 is an apocalyptic number.

28479990 is an abundant number, since it is smaller than the sum of its proper divisors (56744970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28479990 is a wasteful number, since it uses less digits than its factorization.

28479990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12357.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 28479990 is about 5336.6646887358. The cubic root of 28479990 is about 305.3842331171.

The spelling of 28479990 in words is "twenty-eight million, four hundred seventy-nine thousand, nine hundred ninety".