70691257 has 16 divisors (see below), whose sum is σ = 89131392. Its totient is φ = 54564480.

The previous prime is 70691251. The next prime is 70691261. The reversal of 70691257 is 75219607.

It is a cyclic number.

It is not a de Polignac number, because 70691257 - 2¹⁹ = 70166969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70691251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5743 + ... + 13204.

It is an arithmetic number, because the mean of its divisors is an integer number (5570712).

Almost surely, 2^70691257 is an apocalyptic number.

It is an amenable number.

70691257 is a deficient number, since it is larger than the sum of its proper divisors (18440135).

70691257 is a wasteful number, since it uses less digits than its factorization.

70691257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19008.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 70691257 is about 8407.8092866097. The cubic root of 70691257 is about 413.4806922698.

The spelling of 70691257 in words is "seventy million, six hundred ninety-one thousand, two hundred fifty-seven".