646074760 has 64 divisors (see below), whose sum is σ = 1544540400. Its totient is φ = 242758656.

The previous prime is 646074743. The next prime is 646074799. The reversal of 646074760 is 67470646.

It can be written as a sum of positive squares in 8 ways, for example, as 578210116 + 67864644 = 24046^2 + 8238^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35394 + ... + 50446.

Almost surely, 2^646074760 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646074760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772270200).

646074760 is an abundant number, since it is smaller than the sum of its proper divisors (898465640).

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

646074760 is a wasteful number, since it uses less digits than its factorization.

646074760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15130 (or 15126 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 646074760 is about 25418.0007081596. Note that the first 3 decimals coincide. The cubic root of 646074760 is about 864.4918931129.

The spelling of 646074760 in words is "six hundred forty-six million, seventy-four thousand, seven hundred sixty".