6409501978 has 8 divisors (see below), whose sum is σ = 10488276000. Its totient is φ = 2913409980.

The previous prime is 6409501939. The next prime is 6409501991. The reversal of 6409501978 is 8791059046.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145670478 + ... + 145670521.

It is an arithmetic number, because the mean of its divisors is an integer number (1311034500).

Almost surely, 2^6409501978 is an apocalyptic number.

6409501978 is a deficient number, since it is larger than the sum of its proper divisors (4078774022).

6409501978 is a wasteful number, since it uses less digits than its factorization.

6409501978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291341012.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 6409501978 is about 80059.3653359805. The cubic root of 6409501978 is about 1857.5539181534.

The spelling of 6409501978 in words is "six billion, four hundred nine million, five hundred one thousand, nine hundred seventy-eight".