55815738 has 32 divisors (see below), whose sum is σ = 122757120. Its totient is φ = 16778160.

The previous prime is 55815737. The next prime is 55815769. The reversal of 55815738 is 83751855.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55815738.

It is not an unprimeable number, because it can be changed into a prime (55815737) 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, 5053 + ... + 11711.

It is an arithmetic number, because the mean of its divisors is an integer number (3836160).

Almost surely, 2^55815738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55815738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61378560).

55815738 is an abundant number, since it is smaller than the sum of its proper divisors (66941382).

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

55815738 is a wasteful number, since it uses less digits than its factorization.

55815738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6802.

The product of its digits is 168000, while the sum is 42.

The square root of 55815738 is about 7470.9931066760. The cubic root of 55815738 is about 382.1661558001.

The spelling of 55815738 in words is "fifty-five million, eight hundred fifteen thousand, seven hundred thirty-eight".