870807257 has 4 divisors (see below), whose sum is σ = 873317136. Its totient is φ = 868297380.

The previous prime is 870807253. The next prime is 870807277. The reversal of 870807257 is 752708078.

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.

It is a cyclic number.

It is not a de Polignac number, because 870807257 - 2² = 870807253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870807253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1254419 + ... + 1255112.

It is an arithmetic number, because the mean of its divisors is an integer number (218329284).

Almost surely, 2^870807257 is an apocalyptic number.

It is an amenable number.

870807257 is a deficient number, since it is larger than the sum of its proper divisors (2509879).

870807257 is a wasteful number, since it uses less digits than its factorization.

870807257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509878.

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 870807257 is about 29509.4435223709. The cubic root of 870807257 is about 954.9354440432.

The spelling of 870807257 in words is "eight hundred seventy million, eight hundred seven thousand, two hundred fifty-seven".