71770769 has 4 divisors (see below), whose sum is σ = 82023744. Its totient is φ = 61517796.

The previous prime is 71770763. The next prime is 71770799. The reversal of 71770769 is 96707717.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96707717 = 47 ⋅2057611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71770769 is a prime.

It is a super-2 number, since 2×71770769² = 10302086565702722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71770763) 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, 5126477 + ... + 5126490.

It is an arithmetic number, because the mean of its divisors is an integer number (20505936).

Almost surely, 2^71770769 is an apocalyptic number.

It is an amenable number.

71770769 is a deficient number, since it is larger than the sum of its proper divisors (10252975).

71770769 is a wasteful number, since it uses less digits than its factorization.

71770769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10252974.

The product of its (nonzero) digits is 129654, while the sum is 44.

The square root of 71770769 is about 8471.7630396512. The cubic root of 71770769 is about 415.5747955188.

The spelling of 71770769 in words is "seventy-one million, seven hundred seventy thousand, seven hundred sixty-nine".