77780226 has 32 divisors (see below), whose sum is σ = 158760000. Its totient is φ = 25399296.

The previous prime is 77780221. The next prime is 77780257. The reversal of 77780226 is 62208777.

It is a super-2 number, since 2×77780226² = 12099527113222152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77780221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61650 + ... + 62898.

It is an arithmetic number, because the mean of its divisors is an integer number (4961250).

Almost surely, 2^77780226 is an apocalyptic number.

77780226 is an abundant number, since it is smaller than the sum of its proper divisors (80979774).

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

77780226 is a wasteful number, since it uses less digits than its factorization.

77780226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458.

The product of its (nonzero) digits is 65856, while the sum is 39.

The square root of 77780226 is about 8819.3098369430. The cubic root of 77780226 is about 426.8642003903.

It can be divided in two parts, 777 and 80226, that added together give a triangular number (81003 = T₄₀₂).

The spelling of 77780226 in words is "seventy-seven million, seven hundred eighty thousand, two hundred twenty-six".