55457621 has 8 divisors (see below), whose sum is σ = 58786560. Its totient is φ = 52136128.

The previous prime is 55457593. The next prime is 55457629. The reversal of 55457621 is 12675455.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55457621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55457629) 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, 23330 + ... + 25596.

It is an arithmetic number, because the mean of its divisors is an integer number (7348320).

Almost surely, 2^55457621 is an apocalyptic number.

It is an amenable number.

55457621 is a deficient number, since it is larger than the sum of its proper divisors (3328939).

55457621 is a wasteful number, since it uses less digits than its factorization.

55457621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3723.

The product of its digits is 42000, while the sum is 35.

The square root of 55457621 is about 7446.9873774567. The cubic root of 55457621 is about 381.3470681442.

The spelling of 55457621 in words is "fifty-five million, four hundred fifty-seven thousand, six hundred twenty-one".