72277778 has 16 divisors (see below), whose sum is σ = 115914240. Its totient is φ = 33681216.

The previous prime is 72277769. The next prime is 72277781. The reversal of 72277778 is 87777227.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6818 + ... + 13821.

It is an arithmetic number, because the mean of its divisors is an integer number (7244640).

Almost surely, 2^72277778 is an apocalyptic number.

72277778 is a deficient number, since it is larger than the sum of its proper divisors (43636462).

72277778 is a wasteful number, since it uses less digits than its factorization.

72277778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20761.

The product of its digits is 537824, while the sum is 47.

The square root of 72277778 is about 8501.6338429739. The cubic root of 72277778 is about 416.5510794758.

The spelling of 72277778 in words is "seventy-two million, two hundred seventy-seven thousand, seven hundred seventy-eight".