56691398 has 16 divisors (see below), whose sum is σ = 86365440. Its totient is φ = 27905856.

The previous prime is 56691377. The next prime is 56691419. The reversal of 56691398 is 89319665.

It is an interprime number because it is at equal distance from previous prime (56691377) and next prime (56691419).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51611 + ... + 52697.

It is an arithmetic number, because the mean of its divisors is an integer number (5397840).

Almost surely, 2^56691398 is an apocalyptic number.

56691398 is a deficient number, since it is larger than the sum of its proper divisors (29674042).

56691398 is a wasteful number, since it uses less digits than its factorization.

56691398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471.

The product of its digits is 349920, while the sum is 47.

The square root of 56691398 is about 7529.3690306692. The cubic root of 56691398 is about 384.1543207501.

The spelling of 56691398 in words is "fifty-six million, six hundred ninety-one thousand, three hundred ninety-eight".