6399785452 has 24 divisors (see below), whose sum is σ = 11666990720. Its totient is φ = 3068254080.

The previous prime is 6399785449. The next prime is 6399785471. The reversal of 6399785452 is 2545879936.

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, 223233 + ... + 250264.

Almost surely, 2^6399785452 is an apocalyptic number.

6399785452 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

6399785452 is a deficient number, since it is larger than the sum of its proper divisors (5267205268).

6399785452 is a wasteful number, since it uses less digits than its factorization.

6399785452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473641 (or 473639 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 58.

The square root of 6399785452 is about 79998.6590637618. The cubic root of 6399785452 is about 1856.6147864716.

The spelling of 6399785452 in words is "six billion, three hundred ninety-nine million, seven hundred eighty-five thousand, four hundred fifty-two".