70929721 has 4 divisors (see below), whose sum is σ = 72438912. Its totient is φ = 69420532.

The previous prime is 70929709. The next prime is 70929779. The reversal of 70929721 is 12792907.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 70929721 - 2⁵ = 70929689 is a prime.

It is a super-2 number, since 2×70929721² = 10062050642275682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70929791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754525 + ... + 754618.

It is an arithmetic number, because the mean of its divisors is an integer number (18109728).

Almost surely, 2^70929721 is an apocalyptic number.

It is an amenable number.

70929721 is a deficient number, since it is larger than the sum of its proper divisors (1509191).

70929721 is a wasteful number, since it uses less digits than its factorization.

70929721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509190.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 70929721 is about 8421.9784492719. The cubic root of 70929721 is about 413.9451042369.

The spelling of 70929721 in words is "seventy million, nine hundred twenty-nine thousand, seven hundred twenty-one".