55700821 has 8 divisors (see below), whose sum is σ = 60819264. Its totient is φ = 50591520.

The previous prime is 55700797. The next prime is 55700833. The reversal of 55700821 is 12800755.

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

It is a cyclic number.

It is not a de Polignac number, because 55700821 - 2⁷ = 55700693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55700821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55700861) 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, 19720 + ... + 22366.

It is an arithmetic number, because the mean of its divisors is an integer number (7602408).

Almost surely, 2^55700821 is an apocalyptic number.

It is an amenable number.

55700821 is a deficient number, since it is larger than the sum of its proper divisors (5118443).

55700821 is a wasteful number, since it uses less digits than its factorization.

55700821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4571.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 55700821 is about 7463.2982655124. The cubic root of 55700821 is about 381.9036995814.

The spelling of 55700821 in words is "fifty-five million, seven hundred thousand, eight hundred twenty-one".