55721627 has 4 divisors (see below), whose sum is σ = 60007920. Its totient is φ = 51435336.

The previous prime is 55721579. The next prime is 55721629. The reversal of 55721627 is 72612755.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72612755 = 5 ⋅14522551.

It is a cyclic number.

It is not a de Polignac number, because 55721627 - 2¹² = 55717531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55721629) 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, 2143127 + ... + 2143152.

It is an arithmetic number, because the mean of its divisors is an integer number (15001980).

Almost surely, 2^55721627 is an apocalyptic number.

55721627 is a deficient number, since it is larger than the sum of its proper divisors (4286293).

55721627 is a wasteful number, since it uses less digits than its factorization.

55721627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4286292.

The product of its digits is 29400, while the sum is 35.

The square root of 55721627 is about 7464.6920231179. The cubic root of 55721627 is about 381.9512446570.

The spelling of 55721627 in words is "fifty-five million, seven hundred twenty-one thousand, six hundred twenty-seven".