61864388 has 12 divisors (see below), whose sum is σ = 112969920. Its totient is φ = 29587272.

The previous prime is 61864379. The next prime is 61864403. The reversal of 61864388 is 88346816.

It is a super-2 number, since 2×61864388² = 7654405005229088, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336128 + ... + 336311.

It is an arithmetic number, because the mean of its divisors is an integer number (9414160).

Almost surely, 2^61864388 is an apocalyptic number.

It is an amenable number.

61864388 is a deficient number, since it is larger than the sum of its proper divisors (51105532).

61864388 is a wasteful number, since it uses less digits than its factorization.

61864388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672466 (or 672464 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The square root of 61864388 is about 7865.3917893516. The cubic root of 61864388 is about 395.5003817170.

The spelling of 61864388 in words is "sixty-one million, eight hundred sixty-four thousand, three hundred eighty-eight".