71985077 has 4 divisors (see below), whose sum is σ = 73343340. Its totient is φ = 70626816.

The previous prime is 71985073. The next prime is 71985079. The reversal of 71985077 is 77058917.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25867396 + 46117681 = 5086^2 + 6791^2 .

It is a cyclic number.

It is not a de Polignac number, because 71985077 - 2² = 71985073 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71985073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679052 + ... + 679157.

It is an arithmetic number, because the mean of its divisors is an integer number (18335835).

Almost surely, 2^71985077 is an apocalyptic number.

It is an amenable number.

71985077 is a deficient number, since it is larger than the sum of its proper divisors (1358263).

71985077 is a wasteful number, since it uses less digits than its factorization.

71985077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358262.

The product of its (nonzero) digits is 123480, while the sum is 44.

The square root of 71985077 is about 8484.4019824617. The cubic root of 71985077 is about 415.9880208736.

The spelling of 71985077 in words is "seventy-one million, nine hundred eighty-five thousand, seventy-seven".