252866640 has 80 divisors (see below), whose sum is σ = 844195968. Its totient is φ = 62243328.

The previous prime is 252866633. The next prime is 252866641. The reversal of 252866640 is 46668252.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252866641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37404 + ... + 43643.

Almost surely, 2^252866640 is an apocalyptic number.

252866640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

252866640 is an abundant number, since it is smaller than the sum of its proper divisors (591329328).

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

252866640 is a wasteful number, since it uses less digits than its factorization.

252866640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81076 (or 81070 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 252866640 is about 15901.7810323246. The cubic root of 252866640 is about 632.3592066858.

The spelling of 252866640 in words is "two hundred fifty-two million, eight hundred sixty-six thousand, six hundred forty".