55378617 has 32 divisors (see below), whose sum is σ = 87711744. Its totient is φ = 30412800.

The previous prime is 55378607. The next prime is 55378621. The reversal of 55378617 is 71687355.

It is not a de Polignac number, because 55378617 - 2⁶ = 55378553 is a prime.

It is a super-3 number, since 3×55378617³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (55378607) 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, 167142 + ... + 167472.

It is an arithmetic number, because the mean of its divisors is an integer number (2740992).

Almost surely, 2^55378617 is an apocalyptic number.

It is an amenable number.

55378617 is a deficient number, since it is larger than the sum of its proper divisors (32333127).

55378617 is a wasteful number, since it uses less digits than its factorization.

55378617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629.

The product of its digits is 176400, while the sum is 42.

The square root of 55378617 is about 7441.6810600831. The cubic root of 55378617 is about 381.1658951984.

The spelling of 55378617 in words is "fifty-five million, three hundred seventy-eight thousand, six hundred seventeen".