70622721 has 12 divisors (see below), whose sum is σ = 109857748. Its totient is φ = 43460064.

The previous prime is 70622711. The next prime is 70622723. The reversal of 70622721 is 12722607.

It can be written as a sum of positive squares in 2 ways, for example, as 42107121 + 28515600 = 6489^2 + 5340^2 .

It is not a de Polignac number, because 70622721 - 2¹⁰ = 70621697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70622723) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 301690 + ... + 301923.

Almost surely, 2^70622721 is an apocalyptic number.

It is an amenable number.

70622721 is a deficient number, since it is larger than the sum of its proper divisors (39235027).

70622721 is a wasteful number, since it uses less digits than its factorization.

70622721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603632 (or 603629 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 70622721 is about 8403.7325635696. The cubic root of 70622721 is about 413.3470242748.

The spelling of 70622721 in words is "seventy million, six hundred twenty-two thousand, seven hundred twenty-one".