61881822 has 48 divisors (see below), whose sum is σ = 147288960. Its totient is φ = 18689616.

The previous prime is 61881821. The next prime is 61881863. The reversal of 61881822 is 22818816.

61881822 is a `hidden beast` number, since 618 + 8 + 18 + 22 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61881821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3933 + ... + 11799.

It is an arithmetic number, because the mean of its divisors is an integer number (3068520).

Almost surely, 2^61881822 is an apocalyptic number.

It is a pronic number, being equal to 7866×7867.

It is a practical number, because each smaller number is the sum of distinct divisors of 61881822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73644480).

61881822 is an abundant number, since it is smaller than the sum of its proper divisors (85407138).

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

61881822 is a wasteful number, since it uses less digits than its factorization.

61881822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7917 (or 7914 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 61881822 is about 7866.4999841098. The cubic root of 61881822 is about 395.5375302084.

The spelling of 61881822 in words is "sixty-one million, eight hundred eighty-one thousand, eight hundred twenty-two".