1640516340 has 24 divisors (see below), whose sum is σ = 4593445920. Its totient is φ = 437471008.

The previous prime is 1640516327. The next prime is 1640516357. The reversal of 1640516340 is 436150461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1640516298 and 1640516307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13670910 + ... + 13671029.

It is an arithmetic number, because the mean of its divisors is an integer number (191393580).

Almost surely, 2^1640516340 is an apocalyptic number.

1640516340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640516340 is an abundant number, since it is smaller than the sum of its proper divisors (2952929580).

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

1640516340 is a wasteful number, since it uses less digits than its factorization.

1640516340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27341951 (or 27341949 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1640516340 is about 40503.2880146785. The cubic root of 1640516340 is about 1179.3974564279.

The spelling of 1640516340 in words is "one billion, six hundred forty million, five hundred sixteen thousand, three hundred forty".