55378731 has 16 divisors (see below), whose sum is σ = 74907648. Its totient is φ = 36388800.

The previous prime is 55378723. The next prime is 55378747. The reversal of 55378731 is 13787355.

It is not a de Polignac number, because 55378731 - 2³ = 55378723 is a prime.

It is a super-2 number, since 2×55378731² = 6133607694340722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55378731.

It is not an unprimeable number, because it can be changed into a prime (55378781) 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, 72391 + ... + 73151.

It is an arithmetic number, because the mean of its divisors is an integer number (4681728).

Almost surely, 2^55378731 is an apocalyptic number.

55378731 is a deficient number, since it is larger than the sum of its proper divisors (19528917).

55378731 is a wasteful number, since it uses less digits than its factorization.

55378731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082.

The product of its digits is 88200, while the sum is 39.

The square root of 55378731 is about 7441.6887196388. The cubic root of 55378731 is about 381.1661567487.

The spelling of 55378731 in words is "fifty-five million, three hundred seventy-eight thousand, seven hundred thirty-one".