55788709 has 4 divisors (see below), whose sum is σ = 56703340. Its totient is φ = 54874080.

The previous prime is 55788703. The next prime is 55788727. The reversal of 55788709 is 90788755.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12623809 + 43164900 = 3553^2 + 6570^2 .

It is a cyclic number.

It is not a de Polignac number, because 55788709 - 2⁷ = 55788581 is a prime.

It is a super-2 number, since 2×55788709² = 6224760103773362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55788703) 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, 457224 + ... + 457345.

It is an arithmetic number, because the mean of its divisors is an integer number (14175835).

Almost surely, 2^55788709 is an apocalyptic number.

It is an amenable number.

55788709 is a deficient number, since it is larger than the sum of its proper divisors (914631).

55788709 is an equidigital number, since it uses as much as digits as its factorization.

55788709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914630.

The product of its (nonzero) digits is 705600, while the sum is 49.

The square root of 55788709 is about 7469.1839581041. The cubic root of 55788709 is about 382.1044573305.

The spelling of 55788709 in words is "fifty-five million, seven hundred eighty-eight thousand, seven hundred nine".