55745421 has 16 divisors (see below), whose sum is σ = 76608000. Its totient is φ = 36030528.

The previous prime is 55745413. The next prime is 55745441. The reversal of 55745421 is 12454755.

It is not a de Polignac number, because 55745421 - 2³ = 55745413 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55745441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38020 + ... + 39458.

It is an arithmetic number, because the mean of its divisors is an integer number (4788000).

Almost surely, 2^55745421 is an apocalyptic number.

It is an amenable number.

55745421 is a deficient number, since it is larger than the sum of its proper divisors (20862579).

55745421 is a wasteful number, since it uses less digits than its factorization.

55745421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828.

The product of its digits is 28000, while the sum is 33.

The square root of 55745421 is about 7466.2856227176. The cubic root of 55745421 is about 382.0056032913.

The spelling of 55745421 in words is "fifty-five million, seven hundred forty-five thousand, four hundred twenty-one".