66642460 has 24 divisors (see below), whose sum is σ = 140308560. Its totient is φ = 26588544.

The previous prime is 66642437. The next prime is 66642469. The reversal of 66642460 is 6424666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66642469) 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, 4107 + ... + 12253.

It is an arithmetic number, because the mean of its divisors is an integer number (5846190).

Almost surely, 2^66642460 is an apocalyptic number.

It is an amenable number.

66642460 is an abundant number, since it is smaller than the sum of its proper divisors (73666100).

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

66642460 is a wasteful number, since it uses less digits than its factorization.

66642460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8565 (or 8563 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 66642460 is about 8163.4833251499. The cubic root of 66642460 is about 405.4310504850.

It can be divided in two parts, 6 and 6642460, that added together give a palindrome (6642466).

The spelling of 66642460 in words is "sixty-six million, six hundred forty-two thousand, four hundred sixty".