1640757312 has 168 divisors, whose sum is σ = 5242255200. Its totient is φ = 487600128.

The previous prime is 1640757301. The next prime is 1640757319. The reversal of 1640757312 is 2137570461.

It is a happy number.

1640757312 is a `hidden beast` number, since 1 + 640 + 7 + 5 + 7 + 3 + 1 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1640757319) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181639 + ... + 190457.

It is an arithmetic number, because the mean of its divisors is an integer number (31203900).

Almost surely, 2^1640757312 is an apocalyptic number.

1640757312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640757312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2621127600).

1640757312 is an abundant number, since it is smaller than the sum of its proper divisors (3601497888).

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

1640757312 is a wasteful number, since it uses less digits than its factorization.

1640757312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8873 (or 8860 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 1640757312 is about 40506.2626269075. The cubic root of 1640757312 is about 1179.4552000059.

The spelling of 1640757312 in words is "one billion, six hundred forty million, seven hundred fifty-seven thousand, three hundred twelve".