78322500 has 135 divisors (see below), whose sum is σ = 251662411. Its totient is φ = 20532000.

The previous prime is 78322487. The next prime is 78322513. The reversal of 78322500 is 522387.

The square root of 78322500 is 8850.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (78322487) and next prime (78322513).

It can be written as a sum of positive squares in 2 ways, for example, as 6140484 + 72182016 = 2478^2 + 8496^2 .

It is a super-2 number, since 2×78322500² = 12268828012500000, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1327471 + ... + 1327529.

Almost surely, 2^78322500 is an apocalyptic number.

78322500 is the 8850-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78322500

78322500 is an abundant number, since it is smaller than the sum of its proper divisors (173339911).

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

78322500 is a wasteful number, since it uses less digits than its factorization.

78322500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The cubic root of 78322500 is about 427.8539184696.

Adding to 78322500 its reverse (522387), we get a palindrome (78844887).

The spelling of 78322500 in words is "seventy-eight million, three hundred twenty-two thousand, five hundred".