28130631 has 8 divisors (see below), whose sum is σ = 39713904. Its totient is φ = 17650560.

The previous prime is 28130603. The next prime is 28130647. The reversal of 28130631 is 13603182.

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

It is not a de Polignac number, because 28130631 - 2⁷ = 28130503 is a prime.

It is a super-2 number, since 2×28130631² = 1582664800916322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28130231) 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, 275740 + ... + 275841.

It is an arithmetic number, because the mean of its divisors is an integer number (4964238).

Almost surely, 2^28130631 is an apocalyptic number.

28130631 is a deficient number, since it is larger than the sum of its proper divisors (11583273).

28130631 is a wasteful number, since it uses less digits than its factorization.

28130631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551601.

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

The square root of 28130631 is about 5303.8317281000. The cubic root of 28130631 is about 304.1303940566.

The spelling of 28130631 in words is "twenty-eight million, one hundred thirty thousand, six hundred thirty-one".