71990771436 has 240 divisors, whose sum is σ = 194742890496. Its totient is φ = 23183024256.

The previous prime is 71990771431. The next prime is 71990771477. The reversal of 71990771436 is 63417709917.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (71990771431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 365435290 + ... + 365435486.

Almost surely, 2^71990771436 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 71990771436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97371445248).

71990771436 is an abundant number, since it is smaller than the sum of its proper divisors (122752119060).

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

71990771436 is a wasteful number, since it uses less digits than its factorization.

71990771436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 2000376, while the sum is 54.

The spelling of 71990771436 in words is "seventy-one billion, nine hundred ninety million, seven hundred seventy-one thousand, four hundred thirty-six".