55755821 has 8 divisors (see below), whose sum is σ = 62239584. Its totient is φ = 49507920.

The previous prime is 55755797. The next prime is 55755839. The reversal of 55755821 is 12855755.

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

It is not a de Polignac number, because 55755821 - 2⁶ = 55755757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55755221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58466 + ... + 59411.

It is an arithmetic number, because the mean of its divisors is an integer number (7779948).

Almost surely, 2^55755821 is an apocalyptic number.

It is an amenable number.

55755821 is a deficient number, since it is larger than the sum of its proper divisors (6483763).

55755821 is a wasteful number, since it uses less digits than its factorization.

55755821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117931.

The product of its digits is 70000, while the sum is 38.

The square root of 55755821 is about 7466.9820543510. The cubic root of 55755821 is about 382.0293577759.

The spelling of 55755821 in words is "fifty-five million, seven hundred fifty-five thousand, eight hundred twenty-one".