61881012 has 36 divisors (see below), whose sum is σ = 161818020. Its totient is φ = 19915392.

The previous prime is 61880981. The next prime is 61881047. The reversal of 61881012 is 21018816.

61881012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 33108516 + 28772496 = 5754^2 + 5364^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×61881012² = 7658519292288288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28593 + ... + 30680.

It is an arithmetic number, because the mean of its divisors is an integer number (4494945).

Almost surely, 2^61881012 is an apocalyptic number.

It is an amenable number.

61881012 is an abundant number, since it is smaller than the sum of its proper divisors (99937008).

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

61881012 is a wasteful number, since it uses less digits than its factorization.

61881012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59312 (or 59307 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 61881012 is about 7866.4484997996. The cubic root of 61881012 is about 395.5358044092.

Adding to 61881012 its reverse (21018816), we get a palindrome (82899828).

The spelling of 61881012 in words is "sixty-one million, eight hundred eighty-one thousand, twelve".