54778617 has 12 divisors (see below), whose sum is σ = 82565184. Its totient is φ = 34931160.

The previous prime is 54778613. The next prime is 54778621. The reversal of 54778617 is 71687745.

It is an interprime number because it is at equal distance from previous prime (54778613) and next prime (54778621).

It is not a de Polignac number, because 54778617 - 2² = 54778613 is a prime.

It is a super-3 number, since 3×54778617³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (54778613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132109 + ... + 132522.

It is an arithmetic number, because the mean of its divisors is an integer number (6880432).

Almost surely, 2^54778617 is an apocalyptic number.

It is an amenable number.

54778617 is a deficient number, since it is larger than the sum of its proper divisors (27786567).

54778617 is a wasteful number, since it uses less digits than its factorization.

54778617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264660 (or 264657 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 54778617 is about 7401.2577985097. The cubic root of 54778617 is about 379.7843120401.

The spelling of 54778617 in words is "fifty-four million, seven hundred seventy-eight thousand, six hundred seventeen".