55207387 has 4 divisors (see below), whose sum is σ = 57111120. Its totient is φ = 53303656.

The previous prime is 55207363. The next prime is 55207403. The reversal of 55207387 is 78370255.

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

It is a cyclic number.

It is not a de Polignac number, because 55207387 - 2¹⁵ = 55174619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55207987) 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, 951823 + ... + 951880.

It is an arithmetic number, because the mean of its divisors is an integer number (14277780).

Almost surely, 2^55207387 is an apocalyptic number.

55207387 is a deficient number, since it is larger than the sum of its proper divisors (1903733).

55207387 is a wasteful number, since it uses less digits than its factorization.

55207387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903732.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 55207387 is about 7430.1673601609. The cubic root of 55207387 is about 380.7726361882.

The spelling of 55207387 in words is "fifty-five million, two hundred seven thousand, three hundred eighty-seven".