55420771 has 4 divisors (see below), whose sum is σ = 63338032. Its totient is φ = 47503512.

The previous prime is 55420759. The next prime is 55420789. The reversal of 55420771 is 17702455.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55420771 - 2⁹ = 55420259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55420471) 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, 3958620 + ... + 3958633.

It is an arithmetic number, because the mean of its divisors is an integer number (15834508).

Almost surely, 2^55420771 is an apocalyptic number.

55420771 is a deficient number, since it is larger than the sum of its proper divisors (7917261).

55420771 is an equidigital number, since it uses as much as digits as its factorization.

55420771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7917260.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 55420771 is about 7444.5128114605. The cubic root of 55420771 is about 381.2625846961.

The spelling of 55420771 in words is "fifty-five million, four hundred twenty thousand, seven hundred seventy-one".