7720505394 has 32 divisors (see below), whose sum is σ = 17653109760. Its totient is φ = 2205078672.

The previous prime is 7720505363. The next prime is 7720505407. The reversal of 7720505394 is 4935050277.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93427 + ... + 155465.

It is an arithmetic number, because the mean of its divisors is an integer number (551659680).

Almost surely, 2^7720505394 is an apocalyptic number.

7720505394 is an abundant number, since it is smaller than the sum of its proper divisors (9932604366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7720505394 is a wasteful number, since it uses less digits than its factorization.

7720505394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65014.

The product of its (nonzero) digits is 264600, while the sum is 42.

The square root of 7720505394 is about 87866.4065158010. The cubic root of 7720505394 is about 1976.4321519873.

The spelling of 7720505394 in words is "seven billion, seven hundred twenty million, five hundred five thousand, three hundred ninety-four".