28631280 has 40 divisors (see below), whose sum is σ = 88757712. Its totient is φ = 7634944.

The previous prime is 28631279. The next prime is 28631287. The reversal of 28631280 is 8213682.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28631287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59409 + ... + 59888.

Almost surely, 2^28631280 is an apocalyptic number.

28631280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28631280 is an abundant number, since it is smaller than the sum of its proper divisors (60126432).

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

28631280 is a wasteful number, since it uses less digits than its factorization.

28631280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119313 (or 119307 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 28631280 is about 5350.8204978302. The cubic root of 28631280 is about 305.9240274464.

The spelling of 28631280 in words is "twenty-eight million, six hundred thirty-one thousand, two hundred eighty".