71787013781 has 8 divisors (see below), whose sum is σ = 82047250560. Its totient is φ = 61528014288.

The previous prime is 71787013769. The next prime is 71787013787. The reversal of 71787013781 is 18731078717.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71787013781 - 2³⁰ = 70713271957 is a prime.

It is a super-2 number, since 2×71787013781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71787013787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181466 + ... + 420123.

It is an arithmetic number, because the mean of its divisors is an integer number (10255906320).

Almost surely, 2^71787013781 is an apocalyptic number.

It is an amenable number.

71787013781 is a deficient number, since it is larger than the sum of its proper divisors (10260236779).

71787013781 is a wasteful number, since it uses less digits than its factorization.

71787013781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618643.

The product of its (nonzero) digits is 460992, while the sum is 50.

The spelling of 71787013781 in words is "seventy-one billion, seven hundred eighty-seven million, thirteen thousand, seven hundred eighty-one".