61778266 has 16 divisors (see below), whose sum is σ = 102096288. Its totient is φ = 27802000.

The previous prime is 61778263. The next prime is 61778293. The reversal of 61778266 is 66287716.

It is not an unprimeable number, because it can be changed into a prime (61778263) 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, 11680 + ... + 16123.

It is an arithmetic number, because the mean of its divisors is an integer number (6381018).

Almost surely, 2^61778266 is an apocalyptic number.

61778266 is a deficient number, since it is larger than the sum of its proper divisors (40318022).

61778266 is a wasteful number, since it uses less digits than its factorization.

61778266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27917.

The product of its digits is 169344, while the sum is 43.

The square root of 61778266 is about 7859.9151394910. The cubic root of 61778266 is about 395.3167698800.

The spelling of 61778266 in words is "sixty-one million, seven hundred seventy-eight thousand, two hundred sixty-six".