1640268252 has 96 divisors (see below), whose sum is σ = 5115891200. Its totient is φ = 443978496.

The previous prime is 1640268251. The next prime is 1640268277. The reversal of 1640268252 is 2528620461.

It is a happy number.

1640268252 is a `hidden beast` number, since 1 + 640 + 2 + 6 + 8 + 2 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640268251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42733 + ... + 71460.

Almost surely, 2^1640268252 is an apocalyptic number.

1640268252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1640268252 is an abundant number, since it is smaller than the sum of its proper divisors (3475622948).

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

1640268252 is a wasteful number, since it uses less digits than its factorization.

1640268252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114232 (or 114224 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 1640268252 is about 40500.2253327065. The cubic root of 1640268252 is about 1179.3380017511.

The spelling of 1640268252 in words is "one billion, six hundred forty million, two hundred sixty-eight thousand, two hundred fifty-two".