240545640 has 128 divisors (see below), whose sum is σ = 740275200. Its totient is φ = 62515200.

The previous prime is 240545639. The next prime is 240545653. The reversal of 240545640 is 46545042.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 240545598 and 240545607.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1078569 + ... + 1078791.

It is an arithmetic number, because the mean of its divisors is an integer number (5783400).

Almost surely, 2^240545640 is an apocalyptic number.

240545640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 240545640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370137600).

240545640 is an abundant number, since it is smaller than the sum of its proper divisors (499729560).

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

240545640 is a wasteful number, since it uses less digits than its factorization.

240545640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 240545640 is about 15509.5338421243. The cubic root of 240545640 is about 621.9170976106.

The spelling of 240545640 in words is "two hundred forty million, five hundred forty-five thousand, six hundred forty".