70721312 has 24 divisors (see below), whose sum is σ = 140915376. Its totient is φ = 34933312.

The previous prime is 70721293. The next prime is 70721317. The reversal of 70721312 is 21312707.

It is not an unprimeable number, because it can be changed into a prime (70721317) 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, 10658 + ... + 15969.

It is an arithmetic number, because the mean of its divisors is an integer number (5871474).

Almost surely, 2^70721312 is an apocalyptic number.

It is an amenable number.

70721312 is a deficient number, since it is larger than the sum of its proper divisors (70194064).

70721312 is a wasteful number, since it uses less digits than its factorization.

70721312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26720 (or 26712 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 70721312 is about 8409.5964231347. The cubic root of 70721312 is about 413.5392822661.

The spelling of 70721312 in words is "seventy million, seven hundred twenty-one thousand, three hundred twelve".