32440640 has 28 divisors (see below), whose sum is σ = 77250036. Its totient is φ = 12976128.

The previous prime is 32440637. The next prime is 32440643. The reversal of 32440640 is 4604423.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (32440637) and next prime (32440643).

It can be written as a sum of positive squares in 2 ways, for example, as 22505536 + 9935104 = 4744^2 + 3152^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32440643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50369 + ... + 51008.

Almost surely, 2^32440640 is an apocalyptic number.

It is an amenable number.

32440640 is an abundant number, since it is smaller than the sum of its proper divisors (44809396).

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

32440640 is a wasteful number, since it uses less digits than its factorization.

32440640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101394 (or 101384 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 32440640 is about 5695.6685296811. The cubic root of 32440640 is about 318.9308065581.

The spelling of 32440640 in words is "thirty-two million, four hundred forty thousand, six hundred forty".