420724640 has 48 divisors (see below), whose sum is σ = 1135959552. Its totient is φ = 144248064.

The previous prime is 420724621. The next prime is 420724649. The reversal of 420724640 is 46427024.

It is not an unprimeable number, because it can be changed into a prime (420724649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186704 + ... + 188943.

It is an arithmetic number, because the mean of its divisors is an integer number (23665824).

Almost surely, 2^420724640 is an apocalyptic number.

420724640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420724640 is an abundant number, since it is smaller than the sum of its proper divisors (715234912).

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

420724640 is a wasteful number, since it uses less digits than its factorization.

420724640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375669 (or 375661 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 420724640 is about 20511.5733184951. The cubic root of 420724640 is about 749.3176846344.

The spelling of 420724640 in words is "four hundred twenty million, seven hundred twenty-four thousand, six hundred forty".