55746021 has 4 divisors (see below), whose sum is σ = 74328032. Its totient is φ = 37164012.

The previous prime is 55746011. The next prime is 55746023. The reversal of 55746021 is 12064755.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 55746021 - 2⁹ = 55745509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55746021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55746023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9291001 + ... + 9291006.

It is an arithmetic number, because the mean of its divisors is an integer number (18582008).

Almost surely, 2^55746021 is an apocalyptic number.

It is an amenable number.

55746021 is a deficient number, since it is larger than the sum of its proper divisors (18582011).

55746021 is a wasteful number, since it uses less digits than its factorization.

55746021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18582010.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 55746021 is about 7466.3258032315. The cubic root of 55746021 is about 382.0069738226.

The spelling of 55746021 in words is "fifty-five million, seven hundred forty-six thousand, twenty-one".