55807917 has 16 divisors (see below), whose sum is σ = 82321920. Its totient is φ = 33345200.

The previous prime is 55807907. The next prime is 55807931. The reversal of 55807917 is 71970855.

It is a cyclic number.

It is not a de Polignac number, because 55807917 - 2¹⁰ = 55806893 is a prime.

It is a super-2 number, since 2×55807917² = 6229047199757778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55807907) 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, 9567 + ... + 14252.

It is an arithmetic number, because the mean of its divisors is an integer number (5145120).

Almost surely, 2^55807917 is an apocalyptic number.

It is an amenable number.

55807917 is a deficient number, since it is larger than the sum of its proper divisors (26514003).

55807917 is a wasteful number, since it uses less digits than its factorization.

55807917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23904.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 55807917 is about 7470.4696639502. The cubic root of 55807917 is about 382.1483050336.

It can be divided in two parts, 558079 and 17, that added together give a triangular number (558096 = T₁₀₅₆).

The spelling of 55807917 in words is "fifty-five million, eight hundred seven thousand, nine hundred seventeen".