78324100 has 36 divisors (see below), whose sum is σ = 179965044. Its totient is φ = 29486080.

The previous prime is 78324097. The next prime is 78324101. The reversal of 78324100 is 142387.

It can be written as a sum of positive squares in 6 ways, for example, as 1726596 + 76597504 = 1314^2 + 8752^2 .

It is a super-2 number, since 2×78324100² = 12269329281620000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (78324101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21337 + ... + 24736.

It is an arithmetic number, because the mean of its divisors is an integer number (4999029).

Almost surely, 2^78324100 is an apocalyptic number.

It is an amenable number.

78324100 is an abundant number, since it is smaller than the sum of its proper divisors (101640944).

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

78324100 is a wasteful number, since it uses less digits than its factorization.

78324100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46104 (or 46097 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 78324100 is about 8850.0903950186. The cubic root of 78324100 is about 427.8568319006.

Adding to 78324100 its reverse (142387), we get a palindrome (78466487).

The spelling of 78324100 in words is "seventy-eight million, three hundred twenty-four thousand, one hundred".