61783881 has 8 divisors (see below), whose sum is σ = 82566240. Its totient is φ = 41095392.

The previous prime is 61783879. The next prime is 61783903. The reversal of 61783881 is 18838716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61783881 - 2¹ = 61783879 is a prime.

It is a super-2 number, since 2×61783881² = 7634495902844322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61783861) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21916 + ... + 24573.

It is an arithmetic number, because the mean of its divisors is an integer number (10320780).

Almost surely, 2^61783881 is an apocalyptic number.

It is an amenable number.

61783881 is a deficient number, since it is larger than the sum of its proper divisors (20782359).

61783881 is a wasteful number, since it uses less digits than its factorization.

61783881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46935.

The product of its digits is 64512, while the sum is 42.

The square root of 61783881 is about 7860.2723235267. The cubic root of 61783881 is about 395.3287462408.

The spelling of 61783881 in words is "sixty-one million, seven hundred eighty-three thousand, eight hundred eighty-one".