61808880 has 80 divisors (see below), whose sum is σ = 218985984. Its totient is φ = 14127360.

The previous prime is 61808861. The next prime is 61808897. The reversal of 61808880 is 8880816.

It is a happy number.

61808880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 16716 + ... + 20075.

Almost surely, 2^61808880 is an apocalyptic number.

61808880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61808880 is an abundant number, since it is smaller than the sum of its proper divisors (157177104).

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

61808880 is a wasteful number, since it uses less digits than its factorization.

61808880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36814 (or 36808 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 39.

The square root of 61808880 is about 7861.8623747812. The cubic root of 61808880 is about 395.3820583698.

The spelling of 61808880 in words is "sixty-one million, eight hundred eight thousand, eight hundred eighty".