61986388 has 12 divisors (see below), whose sum is σ = 108943380. Its totient is φ = 30859712.

The previous prime is 61986377. The next prime is 61986401. The reversal of 61986388 is 88368916.

It can be written as a sum of positive squares in 2 ways, for example, as 33385284 + 28601104 = 5778^2 + 5348^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32323 + ... + 34186.

It is an arithmetic number, because the mean of its divisors is an integer number (9078615).

Almost surely, 2^61986388 is an apocalyptic number.

It is an amenable number.

61986388 is a deficient number, since it is larger than the sum of its proper divisors (46956992).

61986388 is a wasteful number, since it uses less digits than its factorization.

61986388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66746 (or 66744 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 61986388 is about 7873.1434636999. The cubic root of 61986388 is about 395.7601938907.

The spelling of 61986388 in words is "sixty-one million, nine hundred eighty-six thousand, three hundred eighty-eight".