1640374000 has 40 divisors (see below), whose sum is σ = 3966429168. Its totient is φ = 656148800.

The previous prime is 1640373953. The next prime is 1640374031. The reversal of 1640374000 is 4730461.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 408094 + ... + 412093.

Almost surely, 2^1640374000 is an apocalyptic number.

1640374000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640374000 is an abundant number, since it is smaller than the sum of its proper divisors (2326055168).

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

1640374000 is an equidigital number, since it uses as much as digits as its factorization.

1640374000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820210 (or 820194 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 1640374000 is about 40501.5308352660. The cubic root of 1640374000 is about 1179.3633451575.

The spelling of 1640374000 in words is "one billion, six hundred forty million, three hundred seventy-four thousand".