71766642 has 16 divisors (see below), whose sum is σ = 143684640. Its totient is φ = 23896992.

The previous prime is 71766641. The next prime is 71766703. The reversal of 71766642 is 24666717.

It is a self number, because there is not a number n which added to its sum of digits gives 71766642.

It is not an unprimeable number, because it can be changed into a prime (71766641) 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 7 ways as a sum of consecutive naturals, for example, 409 + ... + 11987.

It is an arithmetic number, because the mean of its divisors is an integer number (8980290).

Almost surely, 2^71766642 is an apocalyptic number.

71766642 is an abundant number, since it is smaller than the sum of its proper divisors (71917998).

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

71766642 is a wasteful number, since it uses less digits than its factorization.

71766642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12617.

The product of its digits is 84672, while the sum is 39.

The square root of 71766642 is about 8471.5194622925. The cubic root of 71766642 is about 415.5668298336.

The spelling of 71766642 in words is "seventy-one million, seven hundred sixty-six thousand, six hundred forty-two".