70631640 has 96 divisors (see below), whose sum is σ = 236995200. Its totient is φ = 18224640.

The previous prime is 70631611. The next prime is 70631681. The reversal of 70631640 is 4613607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7996 + ... + 14324.

It is an arithmetic number, because the mean of its divisors is an integer number (2468700).

Almost surely, 2^70631640 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 70631640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118497600).

70631640 is an abundant number, since it is smaller than the sum of its proper divisors (166363560).

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

70631640 is a wasteful number, since it uses less digits than its factorization.

70631640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6377 (or 6370 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 70631640 is about 8404.2632038746. The cubic root of 70631640 is about 413.3644241846.

The spelling of 70631640 in words is "seventy million, six hundred thirty-one thousand, six hundred forty".