61220878 has 16 divisors (see below), whose sum is σ = 93774960. Its totient is φ = 29966976.

The previous prime is 61220857. The next prime is 61220879. The reversal of 61220878 is 87802216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61220879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31750 + ... + 33622.

It is an arithmetic number, because the mean of its divisors is an integer number (5860935).

Almost surely, 2^61220878 is an apocalyptic number.

61220878 is a deficient number, since it is larger than the sum of its proper divisors (32554082).

61220878 is a wasteful number, since it uses less digits than its factorization.

61220878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 61220878 is about 7824.3771637109. The cubic root of 61220878 is about 394.1242747452.

The spelling of 61220878 in words is "sixty-one million, two hundred twenty thousand, eight hundred seventy-eight".