1640085260 has 24 divisors (see below), whose sum is σ = 3757286736. Its totient is φ = 596394560.

The previous prime is 1640085259. The next prime is 1640085269. The reversal of 1640085260 is 625800461.

It is not an unprimeable number, because it can be changed into a prime (1640085269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3727247 + ... + 3727686.

It is an arithmetic number, because the mean of its divisors is an integer number (156553614).

Almost surely, 2^1640085260 is an apocalyptic number.

1640085260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640085260 is an abundant number, since it is smaller than the sum of its proper divisors (2117201476).

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

1640085260 is a wasteful number, since it uses less digits than its factorization.

1640085260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7454953 (or 7454951 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1640085260 is about 40497.9661217696. The cubic root of 1640085260 is about 1179.2941435904.

The spelling of 1640085260 in words is "one billion, six hundred forty million, eighty-five thousand, two hundred sixty".