55409685 has 16 divisors (see below), whose sum is σ = 88814016. Its totient is φ = 29499008.

The previous prime is 55409677. The next prime is 55409689. The reversal of 55409685 is 58690455.

It is a cyclic number.

It is not a de Polignac number, because 55409685 - 2³ = 55409677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55409689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6262 + ... + 12248.

It is an arithmetic number, because the mean of its divisors is an integer number (5550876).

Almost surely, 2^55409685 is an apocalyptic number.

It is an amenable number.

55409685 is a deficient number, since it is larger than the sum of its proper divisors (33404331).

55409685 is a wasteful number, since it uses less digits than its factorization.

55409685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6612.

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 55409685 is about 7443.7681989702. The cubic root of 55409685 is about 381.2371612625.

It can be divided in two parts, 5540 and 9685, that added together give a triangular number (15225 = T₁₇₄).

The spelling of 55409685 in words is "fifty-five million, four hundred nine thousand, six hundred eighty-five".