42640704 has 84 divisors (see below), whose sum is σ = 123197620. Its totient is φ = 14100480.

The previous prime is 42640679. The next prime is 42640711. The reversal of 42640704 is 40704624.

It can be written as a sum of positive squares in 2 ways, for example, as 17239104 + 25401600 = 4152^2 + 5040^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104052 + ... + 104460.

Almost surely, 2^42640704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42640704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61598810).

42640704 is an abundant number, since it is smaller than the sum of its proper divisors (80556916).

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

42640704 is a wasteful number, since it uses less digits than its factorization.

42640704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 42640704 is about 6529.9849923258. The cubic root of 42640704 is about 349.3612950185.

The spelling of 42640704 in words is "forty-two million, six hundred forty thousand, seven hundred four".