72777722 has 4 divisors (see below), whose sum is σ = 109166586. Its totient is φ = 36388860.

The previous prime is 72777721. The next prime is 72777737. The reversal of 72777722 is 22777727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22777727 = 7 ⋅3253961.

It can be written as a sum of positive squares in only one way, i.e., 54893281 + 17884441 = 7409^2 + 4229^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72777722.

It is not an unprimeable number, because it can be changed into a prime (72777721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18194429 + ... + 18194432.

Almost surely, 2^72777722 is an apocalyptic number.

72777722 is a deficient number, since it is larger than the sum of its proper divisors (36388864).

72777722 is a wasteful number, since it uses less digits than its factorization.

72777722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36388863.

The product of its digits is 134456, while the sum is 41.

The square root of 72777722 is about 8530.9859922520. The cubic root of 72777722 is about 417.5092987997.

The spelling of 72777722 in words is "seventy-two million, seven hundred seventy-seven thousand, seven hundred twenty-two".