55209807 has 24 divisors (see below), whose sum is σ = 82038528. Its totient is φ = 35758800.

The previous prime is 55209797. The next prime is 55209811. The reversal of 55209807 is 70890255.

It is not a de Polignac number, because 55209807 - 2⁶ = 55209743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55209607) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127882 + ... + 128312.

It is an arithmetic number, because the mean of its divisors is an integer number (3418272).

Almost surely, 2^55209807 is an apocalyptic number.

55209807 is a deficient number, since it is larger than the sum of its proper divisors (26828721).

55209807 is a wasteful number, since it uses less digits than its factorization.

55209807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 55209807 is about 7430.3302080056. The cubic root of 55209807 is about 380.7781997934.

The spelling of 55209807 in words is "fifty-five million, two hundred nine thousand, eight hundred seven".