28631040 has 112 divisors (see below), whose sum is σ = 92006928. Its totient is φ = 7602176.

The previous prime is 28631023. The next prime is 28631059. The reversal of 28631040 is 4013682.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28631040.

It is a congruent number.

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, 122764 + ... + 122996.

Almost surely, 2^28631040 is an apocalyptic number.

28631040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28631040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46003464).

28631040 is an abundant number, since it is smaller than the sum of its proper divisors (63375888).

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

28631040 is an equidigital number, since it uses as much as digits as its factorization.

28631040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 28631040 is about 5350.7980713161. The cubic root of 28631040 is about 305.9231726473.

The spelling of 28631040 in words is "twenty-eight million, six hundred thirty-one thousand, forty".