61778466 has 12 divisors (see below), whose sum is σ = 133853382. Its totient is φ = 20592816.

The previous prime is 61778417. The next prime is 61778471. The reversal of 61778466 is 66487716.

61778466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 60512841 + 1265625 = 7779^2 + 1125^2 .

It is a super-2 number, since 2×61778466² = 7633157722626312, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1716051 + ... + 1716086.

Almost surely, 2^61778466 is an apocalyptic number.

61778466 is an abundant number, since it is smaller than the sum of its proper divisors (72074916).

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

61778466 is a wasteful number, since it uses less digits than its factorization.

61778466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432145 (or 3432142 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 61778466 is about 7859.9278622644. The cubic root of 61778466 is about 395.3171964770.

The spelling of 61778466 in words is "sixty-one million, seven hundred seventy-eight thousand, four hundred sixty-six".