71428976645 has 16 divisors (see below), whose sum is σ = 92927746800. Its totient is φ = 52393534464.

The previous prime is 71428976627. The next prime is 71428976651. The reversal of 71428976645 is 54667982417.

It is a Cunningham number, because it is equal to 267262²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 18410690596 + 53018286049 = 135686^2 + 230257^2 .

It is a cyclic number.

It is not a de Polignac number, because 71428976645 - 2¹⁰ = 71428975621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3677924 + ... + 3697293.

It is an arithmetic number, because the mean of its divisors is an integer number (5807984175).

Almost surely, 2^71428976645 is an apocalyptic number.

It is an amenable number.

71428976645 is a deficient number, since it is larger than the sum of its proper divisors (21498770155).

71428976645 is a wasteful number, since it uses less digits than its factorization.

71428976645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7375384.

The product of its digits is 20321280, while the sum is 59.

The spelling of 71428976645 in words is "seventy-one billion, four hundred twenty-eight million, nine hundred seventy-six thousand, six hundred forty-five".