6402905978 has 8 divisors (see below), whose sum is σ = 10976410272. Its totient is φ = 2744102556.

The previous prime is 6402905921. The next prime is 6402905983. The reversal of 6402905978 is 8795092046.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228675200 + ... + 228675227.

It is an arithmetic number, because the mean of its divisors is an integer number (1372051284).

Almost surely, 2^6402905978 is an apocalyptic number.

6402905978 is a deficient number, since it is larger than the sum of its proper divisors (4573504294).

6402905978 is a wasteful number, since it uses less digits than its factorization.

6402905978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457350436.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 6402905978 is about 80018.1603012716. The cubic root of 6402905978 is about 1856.9164983211.

The spelling of 6402905978 in words is "six billion, four hundred two million, nine hundred five thousand, nine hundred seventy-eight".