61863912 has 144 divisors (see below), whose sum is σ = 191711520. Its totient is φ = 18675360.

The previous prime is 61863899. The next prime is 61863929. The reversal of 61863912 is 21936816.

61863912 is a `hidden beast` number, since 6 + 1 + 8 + 639 + 12 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 235093 + ... + 235355.

It is an arithmetic number, because the mean of its divisors is an integer number (1331330).

Almost surely, 2^61863912 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 61863912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95855760).

61863912 is an abundant number, since it is smaller than the sum of its proper divisors (129847608).

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

61863912 is a wasteful number, since it uses less digits than its factorization.

61863912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 279 counting only the distinct ones).

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

The square root of 61863912 is about 7865.3615301523. The cubic root of 61863912 is about 395.4993673550.

The spelling of 61863912 in words is "sixty-one million, eight hundred sixty-three thousand, nine hundred twelve".