78198120 has 576 divisors, whose sum is σ = 358525440. Its totient is φ = 14515200.

The previous prime is 78198101. The next prime is 78198121. The reversal of 78198120 is 2189187.

It is a super-2 number, since 2×78198120² = 12229891943068800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (78198121) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2522505 + ... + 2522535.

It is an arithmetic number, because the mean of its divisors is an integer number (622440).

Almost surely, 2^78198120 is an apocalyptic number.

78198120 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78198120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179262720).

78198120 is an abundant number, since it is smaller than the sum of its proper divisors (280327320).

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

78198120 is a wasteful number, since it uses less digits than its factorization.

78198120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 78198120 is about 8842.9700892856. The cubic root of 78198120 is about 427.6273140865.

The spelling of 78198120 in words is "seventy-eight million, one hundred ninety-eight thousand, one hundred twenty".