55785807 has 32 divisors (see below), whose sum is σ = 103042560. Its totient is φ = 28978560.

The previous prime is 55785803. The next prime is 55785811. The reversal of 55785807 is 70858755.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55785803) and next prime (55785811).

It is not a de Polignac number, because 55785807 - 2² = 55785803 is a prime.

It is a super-2 number, since 2×55785807² = 6224112525282498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55785803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11338 + ... + 15495.

It is an arithmetic number, because the mean of its divisors is an integer number (3220080).

Almost surely, 2^55785807 is an apocalyptic number.

55785807 is a deficient number, since it is larger than the sum of its proper divisors (47256753).

55785807 is a wasteful number, since it uses less digits than its factorization.

55785807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26860 (or 26854 counting only the distinct ones).

The product of its (nonzero) digits is 392000, while the sum is 45.

The square root of 55785807 is about 7468.9896907145. The cubic root of 55785807 is about 382.0978318180.

The spelling of 55785807 in words is "fifty-five million, seven hundred eighty-five thousand, eight hundred seven".