31628649 has 16 divisors (see below), whose sum is σ = 46882304. Its totient is φ = 18835200.

The previous prime is 31628629. The next prime is 31628659. The reversal of 31628649 is 94682613.

It is not a de Polignac number, because 31628649 - 2⁵ = 31628617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31628609) 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, 11872 + ... + 14289.

It is an arithmetic number, because the mean of its divisors is an integer number (2930144).

Almost surely, 2^31628649 is an apocalyptic number.

31628649 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

31628649 is a deficient number, since it is larger than the sum of its proper divisors (15253655).

31628649 is a wasteful number, since it uses less digits than its factorization.

31628649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26208.

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

The square root of 31628649 is about 5623.9353659159. The cubic root of 31628649 is about 316.2473394663.

It can be divided in two parts, 3162 and 8649, that added together give a palindrome (11811).

The spelling of 31628649 in words is "thirty-one million, six hundred twenty-eight thousand, six hundred forty-nine".