698720256 has 252 divisors, whose sum is σ = 2257151442. Its totient is φ = 214990848.

The previous prime is 698720249. The next prime is 698720293. The reversal of 698720256 is 652027896.

It can be written as a sum of positive squares in only one way, i.e., 671846400 + 26873856 = 25920^2 + 5184^2 .

It is a super-2 number, since 2×698720256² = 976419992289411072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 53747706 + ... + 53747718.

Almost surely, 2^698720256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 698720256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128575721).

698720256 is an abundant number, since it is smaller than the sum of its proper divisors (1558431186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

698720256 is an frugal number, since it uses more digits than its factorization.

698720256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 698720256 is about 26433.3171584650. The cubic root of 698720256 is about 887.3625812759.

The spelling of 698720256 in words is "six hundred ninety-eight million, seven hundred twenty thousand, two hundred fifty-six".