1640902450 has 24 divisors (see below), whose sum is σ = 3329541360. Its totient is φ = 596691600.

The previous prime is 1640902433. The next prime is 1640902469. The reversal of 1640902450 is 542090461.

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, 1491180 + ... + 1492279.

It is an arithmetic number, because the mean of its divisors is an integer number (138730890).

Almost surely, 2^1640902450 is an apocalyptic number.

1640902450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640902450 is an abundant number, since it is smaller than the sum of its proper divisors (1688638910).

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

1640902450 is a wasteful number, since it uses less digits than its factorization.

1640902450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983482 (or 2983477 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1640902450 is about 40508.0541374182. The cubic root of 1640902450 is about 1179.4899763701.

The spelling of 1640902450 in words is "one billion, six hundred forty million, nine hundred two thousand, four hundred fifty".