61768757 has 4 divisors (see below), whose sum is σ = 62550720. Its totient is φ = 60986796.

The previous prime is 61768741. The next prime is 61768781. The reversal of 61768757 is 75786716.

61768757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61768757 - 2⁴ = 61768741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61768717) 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 3 ways as a sum of consecutive naturals, for example, 390863 + ... + 391020.

It is an arithmetic number, because the mean of its divisors is an integer number (15637680).

Almost surely, 2^61768757 is an apocalyptic number.

It is an amenable number.

61768757 is a deficient number, since it is larger than the sum of its proper divisors (781963).

61768757 is an equidigital number, since it uses as much as digits as its factorization.

61768757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781962.

The product of its digits is 493920, while the sum is 47.

The square root of 61768757 is about 7859.3102114626. The cubic root of 61768757 is about 395.2964862630.

The spelling of 61768757 in words is "sixty-one million, seven hundred sixty-eight thousand, seven hundred fifty-seven".