70689257 has 4 divisors (see below), whose sum is σ = 71887440. Its totient is φ = 69491076.

The previous prime is 70689251. The next prime is 70689271. The reversal of 70689257 is 75298607.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75298607 = 5717 ⋅13171.

It is a cyclic number.

It is not a de Polignac number, because 70689257 - 2¹⁸ = 70427113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70689251) 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, 599003 + ... + 599120.

It is an arithmetic number, because the mean of its divisors is an integer number (17971860).

Almost surely, 2^70689257 is an apocalyptic number.

It is an amenable number.

70689257 is a deficient number, since it is larger than the sum of its proper divisors (1198183).

70689257 is a wasteful number, since it uses less digits than its factorization.

70689257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198182.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 70689257 is about 8407.6903487224. The cubic root of 70689257 is about 413.4767928287.

The spelling of 70689257 in words is "seventy million, six hundred eighty-nine thousand, two hundred fifty-seven".