78232100 has 36 divisors (see below), whose sum is σ = 173913348. Its totient is φ = 30528000.

The previous prime is 78232067. The next prime is 78232117. The reversal of 78232100 is 123287.

It can be written as a sum of positive squares in 6 ways, for example, as 25321024 + 52911076 = 5032^2 + 7274^2 .

It is a super-2 number, since 2×78232100² = 12240522940820000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5441 + ... + 13640.

Almost surely, 2^78232100 is an apocalyptic number.

It is an amenable number.

78232100 is an abundant number, since it is smaller than the sum of its proper divisors (95681248).

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

78232100 is a wasteful number, since it uses less digits than its factorization.

78232100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19136 (or 19129 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 78232100 is about 8844.8911807891. The cubic root of 78232100 is about 427.6892451232.

Adding to 78232100 its reverse (123287), we get a palindrome (78355387).

The spelling of 78232100 in words is "seventy-eight million, two hundred thirty-two thousand, one hundred".