55420445 has 4 divisors (see below), whose sum is σ = 66504540. Its totient is φ = 44336352.

The previous prime is 55420433. The next prime is 55420451. The reversal of 55420445 is 54402455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54402455 = 5 ⋅10880491.

It can be written as a sum of positive squares in 2 ways, for example, as 39967684 + 15452761 = 6322^2 + 3931^2 .

It is a cyclic number.

It is not a de Polignac number, because 55420445 - 2⁶ = 55420381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5542040 + ... + 5542049.

It is an arithmetic number, because the mean of its divisors is an integer number (16626135).

Almost surely, 2^55420445 is an apocalyptic number.

It is an amenable number.

55420445 is a deficient number, since it is larger than the sum of its proper divisors (11084095).

55420445 is a wasteful number, since it uses less digits than its factorization.

55420445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11084094.

The product of its (nonzero) digits is 16000, while the sum is 29.

The square root of 55420445 is about 7444.4909161070. The cubic root of 55420445 is about 381.2618371314.

The spelling of 55420445 in words is "fifty-five million, four hundred twenty thousand, four hundred forty-five".