75666642 has 16 divisors (see below), whose sum is σ = 157913280. Its totient is φ = 24125552.

The previous prime is 75666631. The next prime is 75666649. The reversal of 75666642 is 24666657.

It is a junction number, because it is equal to n+sod(n) for n = 75666594 and 75666603.

It is not an unprimeable number, because it can be changed into a prime (75666649) 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, 274017 + ... + 274292.

It is an arithmetic number, because the mean of its divisors is an integer number (9869580).

Almost surely, 2^75666642 is an apocalyptic number.

75666642 is an abundant number, since it is smaller than the sum of its proper divisors (82246638).

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

75666642 is a wasteful number, since it uses less digits than its factorization.

75666642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548337.

The product of its digits is 362880, while the sum is 42.

The square root of 75666642 is about 8698.6574826234. The cubic root of 75666642 is about 422.9621324294.

The spelling of 75666642 in words is "seventy-five million, six hundred sixty-six thousand, six hundred forty-two".