6406388740 has 24 divisors (see below), whose sum is σ = 13681442880. Its totient is φ = 2519121888.

The previous prime is 6406388713. The next prime is 6406388759. The reversal of 6406388740 is 478836046.

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, 2713392 + ... + 2715751.

It is an arithmetic number, because the mean of its divisors is an integer number (570060120).

Almost surely, 2^6406388740 is an apocalyptic number.

It is an amenable number.

6406388740 is an abundant number, since it is smaller than the sum of its proper divisors (7275054140).

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

6406388740 is a wasteful number, since it uses less digits than its factorization.

6406388740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5429211 (or 5429209 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 46.

The square root of 6406388740 is about 80039.9196651271. The cubic root of 6406388740 is about 1857.2531176632.

The spelling of 6406388740 in words is "six billion, four hundred six million, three hundred eighty-eight thousand, seven hundred forty".