70557991 has 12 divisors (see below), whose sum is σ = 82810512. Its totient is φ = 59938368.

The previous prime is 70557983. The next prime is 70558003. The reversal of 70557991 is 19975507.

It is not a de Polignac number, because 70557991 - 2³ = 70557983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70557911) 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, 835 + ... + 11908.

It is an arithmetic number, because the mean of its divisors is an integer number (6900876).

Almost surely, 2^70557991 is an apocalyptic number.

70557991 is a deficient number, since it is larger than the sum of its proper divisors (12252521).

70557991 is a wasteful number, since it uses less digits than its factorization.

70557991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12870 (or 12863 counting only the distinct ones).

The product of its (nonzero) digits is 99225, while the sum is 43.

The square root of 70557991 is about 8399.8804158155. The cubic root of 70557991 is about 413.2206998136.

The spelling of 70557991 in words is "seventy million, five hundred fifty-seven thousand, nine hundred ninety-one".