55428551 has 8 divisors (see below), whose sum is σ = 61241184. Its totient is φ = 49899520.

The previous prime is 55428547. The next prime is 55428617. The reversal of 55428551 is 15582455.

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

It is a cyclic number.

It is not a de Polignac number, because 55428551 - 2² = 55428547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55428521) 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, 70490 + ... + 71271.

It is an arithmetic number, because the mean of its divisors is an integer number (7655148).

Almost surely, 2^55428551 is an apocalyptic number.

55428551 is a deficient number, since it is larger than the sum of its proper divisors (5812633).

55428551 is a wasteful number, since it uses less digits than its factorization.

55428551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141801.

The product of its digits is 40000, while the sum is 35.

The square root of 55428551 is about 7445.0353256382. The cubic root of 55428551 is about 381.2804244823.

The spelling of 55428551 in words is "fifty-five million, four hundred twenty-eight thousand, five hundred fifty-one".