61789638 has 32 divisors (see below), whose sum is σ = 131155200. Its totient is φ = 19364576.

The previous prime is 61789621. The next prime is 61789639. The reversal of 61789638 is 83698716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61789639) 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, 4348 + ... + 11936.

It is an arithmetic number, because the mean of its divisors is an integer number (4098600).

Almost surely, 2^61789638 is an apocalyptic number.

61789638 is an abundant number, since it is smaller than the sum of its proper divisors (69365562).

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

61789638 is a wasteful number, since it uses less digits than its factorization.

61789638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7676.

The product of its digits is 435456, while the sum is 48.

The square root of 61789638 is about 7860.6385236824. The cubic root of 61789638 is about 395.3410247233.

The spelling of 61789638 in words is "sixty-one million, seven hundred eighty-nine thousand, six hundred thirty-eight".