720475906 has 8 divisors (see below), whose sum is σ = 1081608444. Its totient is φ = 359939760.

The previous prime is 720475901. The next prime is 720475919. The reversal of 720475906 is 609574027.

It can be written as a sum of positive squares in 2 ways, for example, as 478953225 + 241522681 = 21885^2 + 15541^2 .

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

It is a super-2 number, since 2×720475906² = 1038171062253041672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (720475901) 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, 146065 + ... + 150916.

Almost surely, 2^720475906 is an apocalyptic number.

720475906 is a deficient number, since it is larger than the sum of its proper divisors (361132538).

720475906 is a wasteful number, since it uses less digits than its factorization.

720475906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298196.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 720475906 is about 26841.6822498144. The cubic root of 720475906 is about 896.4783805783.

The spelling of 720475906 in words is "seven hundred twenty million, four hundred seventy-five thousand, nine hundred six".