6404280645 has 24 divisors (see below), whose sum is σ = 11919805344. Its totient is φ = 2927670816.

The previous prime is 6404280541. The next prime is 6404280653. The reversal of 6404280645 is 5460824046.

It is not a de Polignac number, because 6404280645 - 2⁹ = 6404280133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4355919 + ... + 4357388.

It is an arithmetic number, because the mean of its divisors is an integer number (496658556).

Almost surely, 2^6404280645 is an apocalyptic number.

It is an amenable number.

6404280645 is a deficient number, since it is larger than the sum of its proper divisors (5515524699).

6404280645 is a wasteful number, since it uses less digits than its factorization.

6404280645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8713329 (or 8713322 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

The square root of 6404280645 is about 80026.7495591318. The cubic root of 6404280645 is about 1857.0493785676.

The spelling of 6404280645 in words is "six billion, four hundred four million, two hundred eighty thousand, six hundred forty-five".