55609785 has 72 divisors (see below), whose sum is σ = 121168320. Its totient is φ = 23094720.

The previous prime is 55609769. The next prime is 55609787. The reversal of 55609785 is 58790655.

55609785 is a `hidden beast` number, since 5 + 560 + 9 + 7 + 85 = 666.

It is not a de Polignac number, because 55609785 - 2⁴ = 55609769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55609785.

It is not an unprimeable number, because it can be changed into a prime (55609787) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 37386 + ... + 38844.

Almost surely, 2^55609785 is an apocalyptic number.

55609785 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55609785 is an abundant number, since it is smaller than the sum of its proper divisors (65558535).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55609785 is a wasteful number, since it uses less digits than its factorization.

55609785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499 (or 1485 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The square root of 55609785 is about 7457.1968594104. The cubic root of 55609785 is about 381.6955282442.

The spelling of 55609785 in words is "fifty-five million, six hundred nine thousand, seven hundred eighty-five".