61289878 has 24 divisors (see below), whose sum is σ = 101890008. Its totient is φ = 27623232.

The previous prime is 61289873. The next prime is 61289887. The reversal of 61289878 is 87898216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61289873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12426 + ... + 16642.

It is an arithmetic number, because the mean of its divisors is an integer number (4245417).

Almost surely, 2^61289878 is an apocalyptic number.

61289878 is a deficient number, since it is larger than the sum of its proper divisors (40600130).

61289878 is a wasteful number, since it uses less digits than its factorization.

61289878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4288 (or 4275 counting only the distinct ones).

The product of its digits is 387072, while the sum is 49.

The square root of 61289878 is about 7828.7852186658. The cubic root of 61289878 is about 394.2722872399.

The spelling of 61289878 in words is "sixty-one million, two hundred eighty-nine thousand, eight hundred seventy-eight".