720638451 has 40 divisors (see below), whose sum is σ = 1184065344. Its totient is φ = 434004480.

The previous prime is 720638447. The next prime is 720638459. The reversal of 720638451 is 154836027.

It is not a de Polignac number, because 720638451 - 2² = 720638447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720638459) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42211 + ... + 56771.

Almost surely, 2^720638451 is an apocalyptic number.

720638451 is a deficient number, since it is larger than the sum of its proper divisors (463426893).

720638451 is a wasteful number, since it uses less digits than its factorization.

720638451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14633 (or 14624 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 720638451 is about 26844.7099257936. The cubic root of 720638451 is about 896.5457930207.

The spelling of 720638451 in words is "seven hundred twenty million, six hundred thirty-eight thousand, four hundred fifty-one".