61881858 has 12 divisors (see below), whose sum is σ = 134077398. Its totient is φ = 20627280.

The previous prime is 61881821. The next prime is 61881863. The reversal of 61881858 is 85818816.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 37051569 + 24830289 = 6087^2 + 4983^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1718923 + ... + 1718958.

Almost surely, 2^61881858 is an apocalyptic number.

61881858 is an abundant number, since it is smaller than the sum of its proper divisors (72195540).

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

61881858 is a wasteful number, since it uses less digits than its factorization.

61881858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437889 (or 3437886 counting only the distinct ones).

The product of its digits is 122880, while the sum is 45.

The square root of 61881858 is about 7866.5022722936. The cubic root of 61881858 is about 395.5376069102.

The spelling of 61881858 in words is "sixty-one million, eight hundred eighty-one thousand, eight hundred fifty-eight".