77280226 has 4 divisors (see below), whose sum is σ = 115920342. Its totient is φ = 38640112.

The previous prime is 77280223. The next prime is 77280233. The reversal of 77280226 is 62208277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62208277 = 29 ⋅2145113.

It can be written as a sum of positive squares in only one way, i.e., 61638201 + 15642025 = 7851^2 + 3955^2 .

It is a super-2 number, since 2×77280226² = 11944466661222152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77280191 and 77280200.

It is not an unprimeable number, because it can be changed into a prime (77280223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19320055 + ... + 19320058.

Almost surely, 2^77280226 is an apocalyptic number.

77280226 is a deficient number, since it is larger than the sum of its proper divisors (38640116).

77280226 is a wasteful number, since it uses less digits than its factorization.

77280226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38640115.

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 77280226 is about 8790.9172445201. The cubic root of 77280226 is about 425.9475531839.

The spelling of 77280226 in words is "seventy-seven million, two hundred eighty thousand, two hundred twenty-six".