61538378 has 16 divisors (see below), whose sum is σ = 105999840. Its totient is φ = 26499600.

The previous prime is 61538339. The next prime is 61538381. The reversal of 61538378 is 87383516.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73193 + ... + 74028.

It is an arithmetic number, because the mean of its divisors is an integer number (6624990).

Almost surely, 2^61538378 is an apocalyptic number.

61538378 is a deficient number, since it is larger than the sum of its proper divisors (44461462).

61538378 is a wasteful number, since it uses less digits than its factorization.

61538378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147253.

The product of its digits is 120960, while the sum is 41.

The square root of 61538378 is about 7844.6400809725. The cubic root of 61538378 is about 394.8044281005.

It can be divided in two parts, 61538 and 378, that added together give a palindrome (61916).

The spelling of 61538378 in words is "sixty-one million, five hundred thirty-eight thousand, three hundred seventy-eight".