28946631 has 16 divisors (see below), whose sum is σ = 46704384. Its totient is φ = 15567744.

The previous prime is 28946609. The next prime is 28946641. The reversal of 28946631 is 13664982.

It is not a de Polignac number, because 28946631 - 2¹⁴ = 28930247 is a prime.

It is a super-2 number, since 2×28946631² = 1675814892500322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28946631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28946641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40185 + ... + 40898.

It is an arithmetic number, because the mean of its divisors is an integer number (2919024).

Almost surely, 2^28946631 is an apocalyptic number.

28946631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28946631 is a deficient number, since it is larger than the sum of its proper divisors (17757753).

28946631 is a wasteful number, since it uses less digits than its factorization.

28946631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81110.

The product of its digits is 62208, while the sum is 39.

The square root of 28946631 is about 5380.2073380122. The cubic root of 28946631 is about 307.0430996230.

The spelling of 28946631 in words is "twenty-eight million, nine hundred forty-six thousand, six hundred thirty-one".