71267772078 has 160 divisors (see below), whose sum is σ = 173521085760. Its totient is φ = 21794572800.

The previous prime is 71267772077. The next prime is 71267772091. The reversal of 71267772078 is 87027776217.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71267772077) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 16962378 + ... + 16966578.

It is an arithmetic number, because the mean of its divisors is an integer number (1084506786).

Almost surely, 2^71267772078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71267772078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86760542880).

71267772078 is an abundant number, since it is smaller than the sum of its proper divisors (102253313682).

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

71267772078 is a wasteful number, since it uses less digits than its factorization.

71267772078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424 (or 4415 counting only the distinct ones).

The product of its (nonzero) digits is 3226944, while the sum is 54.

The spelling of 71267772078 in words is "seventy-one billion, two hundred sixty-seven million, seven hundred seventy-two thousand, seventy-eight".