70791021 has 12 divisors (see below), whose sum is σ = 116861472. Its totient is φ = 40451976.

The previous prime is 70790989. The next prime is 70791023. The reversal of 70791021 is 12019707.

It is not a de Polignac number, because 70791021 - 2⁵ = 70790989 is a prime.

It is a super-2 number, since 2×70791021² = 10022737308444882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70791023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 561771 + ... + 561896.

It is an arithmetic number, because the mean of its divisors is an integer number (9738456).

Almost surely, 2^70791021 is an apocalyptic number.

It is an amenable number.

70791021 is a deficient number, since it is larger than the sum of its proper divisors (46070451).

70791021 is a wasteful number, since it uses less digits than its factorization.

70791021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123680 (or 1123677 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 70791021 is about 8413.7400126222. The cubic root of 70791021 is about 413.6751109275.

It can be divided in two parts, 7079 and 1021, that added together give a square (8100 = 90²).

The spelling of 70791021 in words is "seventy million, seven hundred ninety-one thousand, twenty-one".