698720257 has 4 divisors (see below), whose sum is σ = 699113920. Its totient is φ = 698326596.

The previous prime is 698720249. The next prime is 698720293. The reversal of 698720257 is 752027896.

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 698720257 - 2³ = 698720249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (698720357) 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, 194157 + ... + 197722.

It is an arithmetic number, because the mean of its divisors is an integer number (174778480).

Almost surely, 2^698720257 is an apocalyptic number.

It is an amenable number.

698720257 is a deficient number, since it is larger than the sum of its proper divisors (393663).

698720257 is a wasteful number, since it uses less digits than its factorization.

698720257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393662.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 698720257 is about 26433.3171773805. The cubic root of 698720257 is about 887.3625816992.

The spelling of 698720257 in words is "six hundred ninety-eight million, seven hundred twenty thousand, two hundred fifty-seven".