42640880 has 20 divisors (see below), whose sum is σ = 99140232. Its totient is φ = 17056320.

The previous prime is 42640859. The next prime is 42640901. The reversal of 42640880 is 8804624.

It is an interprime number because it is at equal distance from previous prime (42640859) and next prime (42640901).

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266426 + ... + 266585.

Almost surely, 2^42640880 is an apocalyptic number.

42640880 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42640880 is an abundant number, since it is smaller than the sum of its proper divisors (56499352).

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

42640880 is a wasteful number, since it uses less digits than its factorization.

42640880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533024 (or 533018 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 42640880 is about 6529.9984686063. The cubic root of 42640880 is about 349.3617756821.

The spelling of 42640880 in words is "forty-two million, six hundred forty thousand, eight hundred eighty".