71999994 has 16 divisors (see below), whose sum is σ = 157091040. Its totient is φ = 21818160.

The previous prime is 71999989. The next prime is 71999999. The reversal of 71999994 is 49999917.

It is an interprime number because it is at equal distance from previous prime (71999989) and next prime (71999999).

It is not an unprimeable number, because it can be changed into a prime (71999999) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 545389 + ... + 545520.

It is an arithmetic number, because the mean of its divisors is an integer number (9818190).

Almost surely, 2^71999994 is an apocalyptic number.

71999994 is an abundant number, since it is smaller than the sum of its proper divisors (85091046).

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

71999994 is a wasteful number, since it uses less digits than its factorization.

71999994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090925.

The product of its digits is 1653372, while the sum is 57.

The square root of 71999994 is about 8485.2810206852. The cubic root of 71999994 is about 416.0167530544.

The spelling of 71999994 in words is "seventy-one million, nine hundred ninety-nine thousand, nine hundred ninety-four".