720624081 has 4 divisors (see below), whose sum is σ = 960832112. Its totient is φ = 480416052.

The previous prime is 720624059. The next prime is 720624089. The reversal of 720624081 is 180426027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 720624081 - 2¹¹ = 720622033 is a prime.

It is a super-2 number, since 2×720624081² = 1038598132234189122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720624089) 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, 120104011 + ... + 120104016.

It is an arithmetic number, because the mean of its divisors is an integer number (240208028).

Almost surely, 2^720624081 is an apocalyptic number.

It is an amenable number.

720624081 is a deficient number, since it is larger than the sum of its proper divisors (240208031).

720624081 is a wasteful number, since it uses less digits than its factorization.

720624081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240208030.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 720624081 is about 26844.4422739605. The cubic root of 720624081 is about 896.5398337454.

The spelling of 720624081 in words is "seven hundred twenty million, six hundred twenty-four thousand, eighty-one".