86783557 has 6 divisors (see below), whose sum is σ = 100952358. Its totient is φ = 74385864.

The previous prime is 86783551. The next prime is 86783561. The reversal of 86783557 is 75538768.

It can be written as a sum of positive squares in only one way, i.e., 85636516 + 1147041 = 9254^2 + 1071^2 .

It is not a de Polignac number, because 86783557 - 2³ = 86783549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 1771093 = 86783557 / (8 + 6 + 7 + 8 + 3 + 5 + 5 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86783557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86783551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 885498 + ... + 885595.

It is an arithmetic number, because the mean of its divisors is an integer number (16825393).

Almost surely, 2^86783557 is an apocalyptic number.

It is an amenable number.

86783557 is a deficient number, since it is larger than the sum of its proper divisors (14168801).

86783557 is a wasteful number, since it uses less digits than its factorization.

86783557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771107 (or 1771100 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 49.

The square root of 86783557 is about 9315.7692650688. The cubic root of 86783557 is about 442.7369975403.

The spelling of 86783557 in words is "eighty-six million, seven hundred eighty-three thousand, five hundred fifty-seven".