78220602 has 24 divisors (see below), whose sum is σ = 169652340. Its totient is φ = 26046720.

The previous prime is 78220601. The next prime is 78220619. The reversal of 78220602 is 20602287.

It can be written as a sum of positive squares in 2 ways, for example, as 77951241 + 269361 = 8829^2 + 519^2 .

It is a super-2 number, since 2×78220602² = 12236925154484808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78220601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24202 + ... + 27242.

Almost surely, 2^78220602 is an apocalyptic number.

78220602 is an abundant number, since it is smaller than the sum of its proper divisors (91431738).

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

78220602 is a wasteful number, since it uses less digits than its factorization.

78220602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4478 (or 4475 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 78220602 is about 8844.2411771729. The cubic root of 78220602 is about 427.6682911845.

Adding to 78220602 its reverse (20602287), we get a palindrome (98822889).

The spelling of 78220602 in words is "seventy-eight million, two hundred twenty thousand, six hundred two".