71812494 has 120 divisors (see below), whose sum is σ = 181218312. Its totient is φ = 21228480.

The previous prime is 71812493. The next prime is 71812547. The reversal of 71812494 is 49421817.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

Its product of digits (16128) is a multiple of the sum of its prime factors (144).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71812493) 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 59 ways as a sum of consecutive naturals, for example, 1177224 + ... + 1177284.

Almost surely, 2^71812494 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71812494, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90609156).

71812494 is an abundant number, since it is smaller than the sum of its proper divisors (109405818).

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

71812494 is a wasteful number, since it uses less digits than its factorization.

71812494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 122 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 71812494 is about 8474.2252743245. The cubic root of 71812494 is about 415.6553134391.

The spelling of 71812494 in words is "seventy-one million, eight hundred twelve thousand, four hundred ninety-four".