28631430 has 24 divisors (see below), whose sum is σ = 74441952. Its totient is φ = 7635024.

The previous prime is 28631429. The next prime is 28631443. The reversal of 28631430 is 3413682.

It is a happy number.

28631430 is a `hidden beast` number, since 28 + 631 + 4 + 3 + 0 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28631394 and 28631403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158974 + ... + 159153.

It is an arithmetic number, because the mean of its divisors is an integer number (3101748).

Almost surely, 2^28631430 is an apocalyptic number.

28631430 is an abundant number, since it is smaller than the sum of its proper divisors (45810522).

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

28631430 is a wasteful number, since it uses less digits than its factorization.

28631430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318140 (or 318137 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 28631430 is about 5350.8345143538. The cubic root of 28631430 is about 305.9245616933.

The spelling of 28631430 in words is "twenty-eight million, six hundred thirty-one thousand, four hundred thirty".