71787064690 has 64 divisors (see below), whose sum is σ = 143700480000. Its totient is φ = 25599724480.

The previous prime is 71787064681. The next prime is 71787064693. The reversal of 71787064690 is 9646078717.

It is a super-2 number, since 2×71787064690² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (71787064693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2706111 + ... + 2732509.

It is an arithmetic number, because the mean of its divisors is an integer number (2245320000).

Almost surely, 2^71787064690 is an apocalyptic number.

71787064690 is an abundant number, since it is smaller than the sum of its proper divisors (71913415310).

71787064690 is a wasteful number, since it uses less digits than its factorization.

71787064690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26895.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The spelling of 71787064690 in words is "seventy-one billion, seven hundred eighty-seven million, sixty-four thousand, six hundred ninety".