1640674816 has 120 divisors (see below), whose sum is σ = 3663796752. Its totient is φ = 733286400.

The previous prime is 1640674787. The next prime is 1640674823. The reversal of 1640674816 is 6184760461.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4398406 + ... + 4398778.

Almost surely, 2^1640674816 is an apocalyptic number.

1640674816 is a gapful number since it is divisible by the number (16) 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 1640674816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1831898376).

1640674816 is an abundant number, since it is smaller than the sum of its proper divisors (2023121936).

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

1640674816 is an equidigital number, since it uses as much as digits as its factorization.

1640674816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 1640674816 is about 40505.2443024357. The cubic root of 1640674816 is about 1179.4354323116.

It can be divided in two parts, 16 and 40674816, that multiplied together give a palindrome (650797056).

The spelling of 1640674816 in words is "one billion, six hundred forty million, six hundred seventy-four thousand, eight hundred sixteen".