28301631 has 8 divisors (see below), whose sum is σ = 37774464. Its totient is φ = 18848280.

The previous prime is 28301627. The next prime is 28301639. The reversal of 28301631 is 13610382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28301631 - 2² = 28301627 is a prime.

It is a super-2 number, since 2×28301631² = 1601964634520322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28301639) 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, 1051 + ... + 7596.

It is an arithmetic number, because the mean of its divisors is an integer number (4721808).

Almost surely, 2^28301631 is an apocalyptic number.

28301631 is a deficient number, since it is larger than the sum of its proper divisors (9472833).

28301631 is a wasteful number, since it uses less digits than its factorization.

28301631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9741.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 28301631 is about 5319.9277250730. The cubic root of 28301631 is about 304.7453971291.

The spelling of 28301631 in words is "twenty-eight million, three hundred one thousand, six hundred thirty-one".