704256991 has 4 divisors (see below), whose sum is σ = 705126184. Its totient is φ = 703387800.

The previous prime is 704256989. The next prime is 704256997. The reversal of 704256991 is 199652407.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199652407 = 37 ⋅5396011.

It is a cyclic number.

It is not a de Polignac number, because 704256991 - 2¹ = 704256989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (704256997) 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, 433380 + ... + 435001.

It is an arithmetic number, because the mean of its divisors is an integer number (176281546).

Almost surely, 2^704256991 is an apocalyptic number.

704256991 is a deficient number, since it is larger than the sum of its proper divisors (869193).

704256991 is an equidigital number, since it uses as much as digits as its factorization.

704256991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869192.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 704256991 is about 26537.8407373320. The cubic root of 704256991 is about 889.7002698140.

The spelling of 704256991 in words is "seven hundred four million, two hundred fifty-six thousand, nine hundred ninety-one".