71787492 has 96 divisors (see below), whose sum is σ = 214099200. Its totient is φ = 20376576.

The previous prime is 71787473. The next prime is 71787497. The reversal of 71787492 is 29478717.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71787497) 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 31 ways as a sum of consecutive naturals, for example, 203188 + ... + 203540.

It is an arithmetic number, because the mean of its divisors is an integer number (2230200).

Almost surely, 2^71787492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71787492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107049600).

71787492 is an abundant number, since it is smaller than the sum of its proper divisors (142311708).

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

71787492 is a wasteful number, since it uses less digits than its factorization.

71787492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 634 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 71787492 is about 8472.7499668053. The cubic root of 71787492 is about 415.6070701143.

It can be divided in two parts, 717 and 87492, that added together give a square (88209 = 297²).

The spelling of 71787492 in words is "seventy-one million, seven hundred eighty-seven thousand, four hundred ninety-two".