70640724 has 96 divisors (see below), whose sum is σ = 208051200. Its totient is φ = 18120960.

The previous prime is 70640711. The next prime is 70640743. The reversal of 70640724 is 42704607.

It is a super-2 number, since 2×70640724² = 9980223774488352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 70640691 and 70640700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81807 + ... + 82665.

It is an arithmetic number, because the mean of its divisors is an integer number (2167200).

Almost surely, 2^70640724 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 70640724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104025600).

70640724 is an abundant number, since it is smaller than the sum of its proper divisors (137410476).

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

70640724 is a wasteful number, since it uses less digits than its factorization.

70640724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 70640724 is about 8404.8036264984. The cubic root of 70640724 is about 413.3821444842.

The spelling of 70640724 in words is "seventy million, six hundred forty thousand, seven hundred twenty-four".