61782738 has 16 divisors (see below), whose sum is σ = 128938176. Its totient is φ = 19698800.

The previous prime is 61782719. The next prime is 61782767. The reversal of 61782738 is 83728716.

It is a self number, because there is not a number n which added to its sum of digits gives 61782738.

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, 223713 + ... + 223988.

It is an arithmetic number, because the mean of its divisors is an integer number (8058636).

Almost surely, 2^61782738 is an apocalyptic number.

61782738 is an abundant number, since it is smaller than the sum of its proper divisors (67155438).

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

61782738 is a wasteful number, since it uses less digits than its factorization.

61782738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447729.

The product of its digits is 112896, while the sum is 42.

The square root of 61782738 is about 7860.1996157858. The cubic root of 61782738 is about 395.3263083690.

The spelling of 61782738 in words is "sixty-one million, seven hundred eighty-two thousand, seven hundred thirty-eight".