61758081 has 72 divisors (see below), whose sum is σ = 117374400. Its totient is φ = 30905280.

The previous prime is 61758077. The next prime is 61758089. The reversal of 61758081 is 18085716.

61758081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61758081 - 2² = 61758077 is a prime.

It is a super-2 number, since 2×61758081² = 7628121137605122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61758089) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 140460 + ... + 140898.

It is an arithmetic number, because the mean of its divisors is an integer number (1630200).

Almost surely, 2^61758081 is an apocalyptic number.

It is an amenable number.

61758081 is a deficient number, since it is larger than the sum of its proper divisors (55616319).

61758081 is a wasteful number, since it uses less digits than its factorization.

61758081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 61758081 is about 7858.6309876466. The cubic root of 61758081 is about 395.2737108414.

The spelling of 61758081 in words is "sixty-one million, seven hundred fifty-eight thousand, eighty-one".