78100000 has 144 divisors (see below), whose sum is σ = 212611392. Its totient is φ = 28000000.

The previous prime is 78099991. The next prime is 78100003. The reversal of 78100000 is 187.

It is a super-2 number, since 2×78100000² = 12199220000000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (78100003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1099965 + ... + 1100035.

It is an arithmetic number, because the mean of its divisors is an integer number (1476468).

Almost surely, 2^78100000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106305696).

78100000 is an abundant number, since it is smaller than the sum of its proper divisors (134511392).

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

78100000 is an equidigital number, since it uses as much as digits as its factorization.

78100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 78100000 is about 8837.4204381143. The cubic root of 78100000 is about 427.4483824458.

78100000 divided by its sum of digits (16) gives a triangular number (4881250 = T₃₁₂₄).

Adding to 78100000 its reverse (187), we get a palindrome (78100187).

The spelling of 78100000 in words is "seventy-eight million, one hundred thousand".