28967631 has 32 divisors (see below), whose sum is σ = 48729600. Its totient is φ = 14868480.

The previous prime is 28967629. The next prime is 28967657. The reversal of 28967631 is 13676982.

It is a happy number.

It is not a de Polignac number, because 28967631 - 2¹ = 28967629 is a prime.

It is a super-2 number, since 2×28967631² = 1678247291504322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28967611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19855 + ... + 21263.

It is an arithmetic number, because the mean of its divisors is an integer number (1522800).

Almost surely, 2^28967631 is an apocalyptic number.

28967631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28967631 is a deficient number, since it is larger than the sum of its proper divisors (19761969).

28967631 is a wasteful number, since it uses less digits than its factorization.

28967631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1519.

The product of its digits is 108864, while the sum is 42.

The square root of 28967631 is about 5382.1585818331. The cubic root of 28967631 is about 307.1173321702.

The spelling of 28967631 in words is "twenty-eight million, nine hundred sixty-seven thousand, six hundred thirty-one".