28451631 has 16 divisors (see below), whose sum is σ = 41959904. Its totient is φ = 17034624.

The previous prime is 28451597. The next prime is 28451641. The reversal of 28451631 is 13615482.

It is not a de Polignac number, because 28451631 - 2⁶ = 28451567 is a prime.

It is a super-2 number, since 2×28451631² = 1618990613120322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28451641) 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 15 ways as a sum of consecutive naturals, for example, 8416 + ... + 11301.

It is an arithmetic number, because the mean of its divisors is an integer number (2622494).

Almost surely, 2^28451631 is an apocalyptic number.

28451631 is a deficient number, since it is larger than the sum of its proper divisors (13508273).

28451631 is a wasteful number, since it uses less digits than its factorization.

28451631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19770.

The product of its digits is 5760, while the sum is 30.

The square root of 28451631 is about 5334.0070303666. The cubic root of 28451631 is about 305.2828371594.

It can be divided in two parts, 284 and 51631, that added together give a palindrome (51915).

The spelling of 28451631 in words is "twenty-eight million, four hundred fifty-one thousand, six hundred thirty-one".