28860531 has 8 divisors (see below), whose sum is σ = 43977984. Its totient is φ = 16491720.

The previous prime is 28860529. The next prime is 28860541. The reversal of 28860531 is 13506882.

It is a happy number.

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

It is not a de Polignac number, because 28860531 - 2¹ = 28860529 is a prime.

It is a super-2 number, since 2×28860531² = 1665860499203922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28860492 and 28860501.

It is not an unprimeable number, because it can be changed into a prime (28860521) 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, 687135 + ... + 687176.

It is an arithmetic number, because the mean of its divisors is an integer number (5497248).

Almost surely, 2^28860531 is an apocalyptic number.

28860531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28860531 is a deficient number, since it is larger than the sum of its proper divisors (15117453).

28860531 is a wasteful number, since it uses less digits than its factorization.

28860531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374321.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28860531 is about 5372.1998287480. The cubic root of 28860531 is about 306.7383702580.

The spelling of 28860531 in words is "twenty-eight million, eight hundred sixty thousand, five hundred thirty-one".