720646874 has 4 divisors (see below), whose sum is σ = 1080970314. Its totient is φ = 360323436.

The previous prime is 720646807. The next prime is 720646889. The reversal of 720646874 is 478646027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 478646027 = 2711 ⋅176557.

It can be written as a sum of positive squares in only one way, i.e., 424566025 + 296080849 = 20605^2 + 17207^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180161717 + ... + 180161720.

Almost surely, 2^720646874 is an apocalyptic number.

720646874 is a deficient number, since it is larger than the sum of its proper divisors (360323440).

720646874 is a wasteful number, since it uses less digits than its factorization.

720646874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360323439.

The product of its (nonzero) digits is 451584, while the sum is 44.

The square root of 720646874 is about 26844.8668091313. The cubic root of 720646874 is about 896.5492860232.

The spelling of 720646874 in words is "seven hundred twenty million, six hundred forty-six thousand, eight hundred seventy-four".