6404251356 has 36 divisors (see below), whose sum is σ = 17140792032. Its totient is φ = 2009176704.

The previous prime is 6404251351. The next prime is 6404251361. The reversal of 6404251356 is 6531524046.

6404251356 is a `hidden beast` number, since 640 + 4 + 2 + 5 + 1 + 3 + 5 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (6404251351) and next prime (6404251361).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6404251356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404251351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5231620 + ... + 5232843.

It is an arithmetic number, because the mean of its divisors is an integer number (476133112).

Almost surely, 2^6404251356 is an apocalyptic number.

It is an amenable number.

6404251356 is an abundant number, since it is smaller than the sum of its proper divisors (10736540676).

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

6404251356 is a wasteful number, since it uses less digits than its factorization.

6404251356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10464490 (or 10464485 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 6404251356 is about 80026.5665638605. The cubic root of 6404251356 is about 1857.0465475860.

The spelling of 6404251356 in words is "six billion, four hundred four million, two hundred fifty-one thousand, three hundred fifty-six".