42640732 has 6 divisors (see below), whose sum is σ = 74621288. Its totient is φ = 21320364.

The previous prime is 42640723. The next prime is 42640733. The reversal of 42640732 is 23704624.

It is a self number, because there is not a number n which added to its sum of digits gives 42640732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42640733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330088 + ... + 5330095.

Almost surely, 2^42640732 is an apocalyptic number.

It is an amenable number.

42640732 is a deficient number, since it is larger than the sum of its proper divisors (31980556).

42640732 is a wasteful number, since it uses less digits than its factorization.

42640732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10660187 (or 10660185 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 42640732 is about 6529.9871362814. The cubic root of 42640732 is about 349.3613714878.

The spelling of 42640732 in words is "forty-two million, six hundred forty thousand, seven hundred thirty-two".