54778440 has 64 divisors (see below), whose sum is σ = 164851200. Its totient is φ = 14561792.

The previous prime is 54778439. The next prime is 54778441. The reversal of 54778440 is 4487745.

It is an interprime number because it is at equal distance from previous prime (54778439) and next prime (54778441).

It is not an unprimeable number, because it can be changed into a prime (54778441) 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, 57004 + ... + 57956.

It is an arithmetic number, because the mean of its divisors is an integer number (2575800).

Almost surely, 2^54778440 is an apocalyptic number.

It is an amenable number.

54778440 is an abundant number, since it is smaller than the sum of its proper divisors (110072760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

54778440 is a wasteful number, since it uses less digits than its factorization.

54778440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446 (or 1442 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 39.

The square root of 54778440 is about 7401.2458410730. The cubic root of 54778440 is about 379.7839029881.

It can be divided in two parts, 547 and 78440, that added together give a palindrome (78987).

The spelling of 54778440 in words is "fifty-four million, seven hundred seventy-eight thousand, four hundred forty".