28415631 has 16 divisors (see below), whose sum is σ = 38666880. Its totient is φ = 18558240.

The previous prime is 28415617. The next prime is 28415657. The reversal of 28415631 is 13651482.

It is not a de Polignac number, because 28415631 - 2¹⁹ = 27891343 is a prime.

It is a super-2 number, since 2×28415631² = 1614896170256322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28415531) 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, 34201 + ... + 35021.

It is an arithmetic number, because the mean of its divisors is an integer number (2416680).

Almost surely, 2^28415631 is an apocalyptic number.

28415631 is a deficient number, since it is larger than the sum of its proper divisors (10251249).

28415631 is a wasteful number, since it uses less digits than its factorization.

28415631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046.

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

The square root of 28415631 is about 5330.6313884942. The cubic root of 28415631 is about 305.1540241491.

The spelling of 28415631 in words is "twenty-eight million, four hundred fifteen thousand, six hundred thirty-one".