61907878 has 4 divisors (see below), whose sum is σ = 92861820. Its totient is φ = 30953938.

The previous prime is 61907873. The next prime is 61907887. The reversal of 61907878 is 87870916.

61907878 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.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61907873) 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 as a sum of consecutive naturals, namely, 15476968 + ... + 15476971.

It is an arithmetic number, because the mean of its divisors is an integer number (23215455).

Almost surely, 2^61907878 is an apocalyptic number.

61907878 is a deficient number, since it is larger than the sum of its proper divisors (30953942).

61907878 is a wasteful number, since it uses less digits than its factorization.

61907878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30953941.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 61907878 is about 7868.1559465989. The cubic root of 61907878 is about 395.5930375146.

The spelling of 61907878 in words is "sixty-one million, nine hundred seven thousand, eight hundred seventy-eight".