55640698 has 8 divisors (see below), whose sum is σ = 84287700. Its totient is φ = 27544800.

The previous prime is 55640693. The next prime is 55640701. The reversal of 55640698 is 89604655.

It can be written as a sum of positive squares in 2 ways, for example, as 49603849 + 6036849 = 7043^2 + 2457^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (55640693) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 137523 + ... + 137926.

Almost surely, 2^55640698 is an apocalyptic number.

55640698 is a deficient number, since it is larger than the sum of its proper divisors (28647002).

55640698 is a wasteful number, since it uses less digits than its factorization.

55640698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275552.

The product of its (nonzero) digits is 259200, while the sum is 43.

The square root of 55640698 is about 7459.2692671602. The cubic root of 55640698 is about 381.7662422271.

The spelling of 55640698 in words is "fifty-five million, six hundred forty thousand, six hundred ninety-eight".