42640632 has 48 divisors (see below), whose sum is σ = 115830000. Its totient is φ = 14171136.

The previous prime is 42640603. The next prime is 42640639. The reversal of 42640632 is 23604624.

42640632 is a `hidden beast` number, since 4 + 26 + 4 + 0 + 632 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 42640596 and 42640605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42640639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31669 + ... + 32987.

It is an arithmetic number, because the mean of its divisors is an integer number (2413125).

Almost surely, 2^42640632 is an apocalyptic number.

It is an amenable number.

42640632 is an abundant number, since it is smaller than the sum of its proper divisors (73189368).

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

42640632 is a wasteful number, since it uses less digits than its factorization.

42640632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780 (or 1773 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 42640632 is about 6529.9794792939. The cubic root of 42640632 is about 349.3610983830.

The spelling of 42640632 in words is "forty-two million, six hundred forty thousand, six hundred thirty-two".