4394645640 has 192 divisors, whose sum is σ = 17806988160. Its totient is φ = 913167360.

The previous prime is 4394645551. The next prime is 4394645663. The reversal of 4394645640 is 465464934.

4394645640 is a `hidden beast` number, since 43 + 9 + 46 + 4 + 564 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51549 + ... + 106988.

It is an arithmetic number, because the mean of its divisors is an integer number (92744730).

Almost surely, 2^4394645640 is an apocalyptic number.

4394645640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4394645640 is an abundant number, since it is smaller than the sum of its proper divisors (13412342520).

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

4394645640 is a wasteful number, since it uses less digits than its factorization.

4394645640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158572 (or 158565 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The square root of 4394645640 is about 66292.1235140345. The cubic root of 4394645640 is about 1637.9775833631.

The spelling of 4394645640 in words is "four billion, three hundred ninety-four million, six hundred forty-five thousand, six hundred forty".