70885721 has 4 divisors (see below), whose sum is σ = 72047844. Its totient is φ = 69723600.

The previous prime is 70885709. The next prime is 70885723. The reversal of 70885721 is 12758807.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12758807 = 1427 ⋅8941.

It can be written as a sum of positive squares in 2 ways, for example, as 33235225 + 37650496 = 5765^2 + 6136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70885721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70885723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580970 + ... + 581091.

It is an arithmetic number, because the mean of its divisors is an integer number (18011961).

Almost surely, 2^70885721 is an apocalyptic number.

It is an amenable number.

70885721 is a deficient number, since it is larger than the sum of its proper divisors (1162123).

70885721 is a wasteful number, since it uses less digits than its factorization.

70885721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162122.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 70885721 is about 8419.3658312251. The cubic root of 70885721 is about 413.8594920196.

The spelling of 70885721 in words is "seventy million, eight hundred eighty-five thousand, seven hundred twenty-one".