85772557 has 4 divisors (see below), whose sum is σ = 92370460. Its totient is φ = 79174656.

The previous prime is 85772521. The next prime is 85772563. The reversal of 85772557 is 75527758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75527758 = 2 ⋅37763879.

It can be written as a sum of positive squares in 2 ways, for example, as 20016676 + 65755881 = 4474^2 + 8109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85772557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85772507) 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, 3298932 + ... + 3298957.

It is an arithmetic number, because the mean of its divisors is an integer number (23092615).

Almost surely, 2^85772557 is an apocalyptic number.

It is an amenable number.

85772557 is a deficient number, since it is larger than the sum of its proper divisors (6597903).

85772557 is a wasteful number, since it uses less digits than its factorization.

85772557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6597902.

The product of its digits is 686000, while the sum is 46.

The square root of 85772557 is about 9261.3474721554. The cubic root of 85772557 is about 441.0110307931.

The spelling of 85772557 in words is "eighty-five million, seven hundred seventy-two thousand, five hundred fifty-seven".