61781804 has 12 divisors (see below), whose sum is σ = 123563664. Its totient is φ = 26477904.

The previous prime is 61781789. The next prime is 61781813. The reversal of 61781804 is 40818716.

61781804 is an admirable number.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103219 + ... + 1103274.

It is an arithmetic number, because the mean of its divisors is an integer number (10296972).

Almost surely, 2^61781804 is an apocalyptic number.

It is an amenable number.

61781804 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61781804 is a wasteful number, since it uses less digits than its factorization.

61781804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206504 (or 2206502 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 61781804 is about 7860.1402023119. The cubic root of 61781804 is about 395.3243162450.

The spelling of 61781804 in words is "sixty-one million, seven hundred eighty-one thousand, eight hundred four".