32072640 has 56 divisors (see below), whose sum is σ = 101833680. Its totient is φ = 8552448.

The previous prime is 32072639. The next prime is 32072653. The reversal of 32072640 is 4627023.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 32072640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15745 + ... + 17664.

Almost surely, 2^32072640 is an apocalyptic number.

32072640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

32072640 is an abundant number, since it is smaller than the sum of its proper divisors (69761040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

32072640 is a wasteful number, since it uses less digits than its factorization.

32072640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33429 (or 33419 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 32072640 is about 5663.2711395447. The cubic root of 32072640 is about 317.7202555435.

Adding to 32072640 its reverse (4627023), we get a palindrome (36699663).

The spelling of 32072640 in words is "thirty-two million, seventy-two thousand, six hundred forty".