720472731 has 16 divisors (see below), whose sum is σ = 1049018880. Its totient is φ = 436209120.

The previous prime is 720472717. The next prime is 720472813. The reversal of 720472731 is 137274027.

It is not a de Polignac number, because 720472731 - 2⁷ = 720472603 is a prime.

It is a super-2 number, since 2×720472731² = 1038161912229196722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 720472692 and 720472701.

It is not an unprimeable number, because it can be changed into a prime (720472031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23781 + ... + 44793.

It is an arithmetic number, because the mean of its divisors is an integer number (65563680).

Almost surely, 2^720472731 is an apocalyptic number.

720472731 is a deficient number, since it is larger than the sum of its proper divisors (328546149).

720472731 is a wasteful number, since it uses less digits than its factorization.

720472731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22066.

The product of its (nonzero) digits is 16464, while the sum is 33.

The square root of 720472731 is about 26841.6231066603. The cubic root of 720472731 is about 896.4770637066.

The spelling of 720472731 in words is "seven hundred twenty million, four hundred seventy-two thousand, seven hundred thirty-one".