72470723649 has 16 divisors (see below), whose sum is σ = 100022538240. Its totient is φ = 46625046480.

The previous prime is 72470723629. The next prime is 72470723651. The reversal of 72470723649 is 94632707427.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-72470723649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72470723629) 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, 1051927 + ... + 1118700.

It is an arithmetic number, because the mean of its divisors is an integer number (6251408640).

Almost surely, 2^72470723649 is an apocalyptic number.

It is an amenable number.

72470723649 is a deficient number, since it is larger than the sum of its proper divisors (27551814591).

72470723649 is a wasteful number, since it uses less digits than its factorization.

72470723649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171020.

The product of its (nonzero) digits is 3556224, while the sum is 51.

The spelling of 72470723649 in words is "seventy-two billion, four hundred seventy million, seven hundred twenty-three thousand, six hundred forty-nine".