61805412 has 36 divisors (see below), whose sum is σ = 156470860. Its totient is φ = 20570112.

The previous prime is 61805411. The next prime is 61805431. The reversal of 61805412 is 21450816.

61805412 is a `hidden beast` number, since 618 + 0 + 5 + 41 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31069476 + 30735936 = 5574^2 + 5544^2 .

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

It is a super-3 number, since 3×61805412³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (61805411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40764 + ... + 42252.

Almost surely, 2^61805412 is an apocalyptic number.

It is an amenable number.

61805412 is an abundant number, since it is smaller than the sum of its proper divisors (94665448).

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

61805412 is a wasteful number, since it uses less digits than its factorization.

61805412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2652 (or 2647 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 61805412 is about 7861.6418132601. The cubic root of 61805412 is about 395.3746634743.

The spelling of 61805412 in words is "sixty-one million, eight hundred five thousand, four hundred twelve".