78220274 has 16 divisors (see below), whose sum is σ = 129802176. Its totient is φ = 35053200.

The previous prime is 78220271. The next prime is 78220291. The reversal of 78220274 is 47202287.

It is a happy number.

It is a super-2 number, since 2×78220274² = 12236822529270152, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78220274.

It is not an unprimeable number, because it can be changed into a prime (78220271) 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, 23477 + ... + 26600.

It is an arithmetic number, because the mean of its divisors is an integer number (8112636).

Almost surely, 2^78220274 is an apocalyptic number.

78220274 is a deficient number, since it is larger than the sum of its proper divisors (51581902).

78220274 is a wasteful number, since it uses less digits than its factorization.

78220274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50161.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 78220274 is about 8844.2226340137. Note that the first 3 decimals coincide. The cubic root of 78220274 is about 427.6676934077.

The spelling of 78220274 in words is "seventy-eight million, two hundred twenty thousand, two hundred seventy-four".