61022778 has 16 divisors (see below), whose sum is σ = 123166560. Its totient is φ = 20154096.

The previous prime is 61022771. The next prime is 61022783. The reversal of 61022778 is 87722016.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61022771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46000 + ... + 47307.

It is an arithmetic number, because the mean of its divisors is an integer number (7697910).

Almost surely, 2^61022778 is an apocalyptic number.

61022778 is an abundant number, since it is smaller than the sum of its proper divisors (62143782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61022778 is a wasteful number, since it uses less digits than its factorization.

61022778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93421.

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 61022778 is about 7811.7077518299. The cubic root of 61022778 is about 393.6987097717.

The spelling of 61022778 in words is "sixty-one million, twenty-two thousand, seven hundred seventy-eight".