78198780 has 96 divisors (see below), whose sum is σ = 241274880. Its totient is φ = 18766080.

The previous prime is 78198751. The next prime is 78198787. The reversal of 78198780 is 8789187.

It is a super-2 number, since 2×78198780² = 12230098386976800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78198787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71397 + ... + 72483.

It is an arithmetic number, because the mean of its divisors is an integer number (2513280).

Almost surely, 2^78198780 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 78198780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120637440).

78198780 is an abundant number, since it is smaller than the sum of its proper divisors (163076100).

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

78198780 is a wasteful number, since it uses less digits than its factorization.

78198780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219 (or 1217 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 48.

The square root of 78198780 is about 8843.0074069855. The cubic root of 78198780 is about 427.6285171556.

The spelling of 78198780 in words is "seventy-eight million, one hundred ninety-eight thousand, seven hundred eighty".