262542640 has 20 divisors (see below), whose sum is σ = 610411824. Its totient is φ = 105017024.

The previous prime is 262542617. The next prime is 262542653. The reversal of 262542640 is 46245262.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1640812 + ... + 1640971.

Almost surely, 2^262542640 is an apocalyptic number.

262542640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

262542640 is an abundant number, since it is smaller than the sum of its proper divisors (347869184).

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

262542640 is a wasteful number, since it uses less digits than its factorization.

262542640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281796 (or 3281790 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 262542640 is about 16203.1675915544. The cubic root of 262542640 is about 640.3242497568.

The spelling of 262542640 in words is "two hundred sixty-two million, five hundred forty-two thousand, six hundred forty".