55716578 has 4 divisors (see below), whose sum is σ = 83574870. Its totient is φ = 27858288.

The previous prime is 55716559. The next prime is 55716589. The reversal of 55716578 is 87561755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87561755 = 5 ⋅17512351.

It can be written as a sum of positive squares in only one way, i.e., 34492129 + 21224449 = 5873^2 + 4607^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13929143 + ... + 13929146.

Almost surely, 2^55716578 is an apocalyptic number.

55716578 is a deficient number, since it is larger than the sum of its proper divisors (27858292).

55716578 is a wasteful number, since it uses less digits than its factorization.

55716578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27858291.

The product of its digits is 294000, while the sum is 44.

The square root of 55716578 is about 7464.3538233393. The cubic root of 55716578 is about 381.9397079630.

The spelling of 55716578 in words is "fifty-five million, seven hundred sixteen thousand, five hundred seventy-eight".