10399785720 has 32 divisors (see below), whose sum is σ = 31199357520. Its totient is φ = 2773276160.

The previous prime is 10399785689. The next prime is 10399785733. The reversal of 10399785720 is 2758799301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43332321 + ... + 43332560.

Almost surely, 2^10399785720 is an apocalyptic number.

10399785720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10399785720 is an abundant number, since it is smaller than the sum of its proper divisors (20799571800).

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

10399785720 is a wasteful number, since it uses less digits than its factorization.

10399785720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86664895 (or 86664891 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 51.

The spelling of 10399785720 in words is "ten billion, three hundred ninety-nine million, seven hundred eighty-five thousand, seven hundred twenty".