61681392 has 80 divisors (see below), whose sum is σ = 179631360. Its totient is φ = 20260800.

The previous prime is 61681387. The next prime is 61681439. The reversal of 61681392 is 29318616.

61681392 is a `hidden beast` number, since 616 + 8 + 1 + 39 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29667 + ... + 31677.

It is an arithmetic number, because the mean of its divisors is an integer number (2245392).

Almost surely, 2^61681392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61681392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89815680).

61681392 is an abundant number, since it is smaller than the sum of its proper divisors (117949968).

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

61681392 is a wasteful number, since it uses less digits than its factorization.

61681392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099 (or 2087 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 61681392 is about 7853.7501870126. The cubic root of 61681392 is about 395.1100307689.

The spelling of 61681392 in words is "sixty-one million, six hundred eighty-one thousand, three hundred ninety-two".