720827978 has 8 divisors (see below), whose sum is σ = 1164414468. Its totient is φ = 332689824.

The previous prime is 720827953. The next prime is 720827983. The reversal of 720827978 is 879728027.

It can be written as a sum of positive squares in 2 ways, for example, as 562496089 + 158331889 = 23717^2 + 12583^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13862051 + ... + 13862102.

Almost surely, 2^720827978 is an apocalyptic number.

720827978 is a deficient number, since it is larger than the sum of its proper divisors (443586490).

720827978 is a wasteful number, since it uses less digits than its factorization.

720827978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27724168.

The product of its (nonzero) digits is 790272, while the sum is 50.

The square root of 720827978 is about 26848.2397560808. The cubic root of 720827978 is about 896.6243829341.

The spelling of 720827978 in words is "seven hundred twenty million, eight hundred twenty-seven thousand, nine hundred seventy-eight".