55428999 has 8 divisors (see below), whose sum is σ = 74096880. Its totient is φ = 36856896.

The previous prime is 55428991. The next prime is 55429009. The reversal of 55428999 is 99982455.

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

It is not a de Polignac number, because 55428999 - 2³ = 55428991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55428991) 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, 22582 + ... + 24915.

It is an arithmetic number, because the mean of its divisors is an integer number (9262110).

Almost surely, 2^55428999 is an apocalyptic number.

55428999 is a deficient number, since it is larger than the sum of its proper divisors (18667881).

55428999 is a wasteful number, since it uses less digits than its factorization.

55428999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47889.

The product of its digits is 1166400, while the sum is 51.

The square root of 55428999 is about 7445.0654127415. The cubic root of 55428999 is about 381.2814517097.

It can be divided in two parts, 5542 and 8999, that added together give a palindrome (14541).

The spelling of 55428999 in words is "fifty-five million, four hundred twenty-eight thousand, nine hundred ninety-nine".