78140220 has 48 divisors (see below), whose sum is σ = 221266080. Its totient is φ = 20601856.

The previous prime is 78140213. The next prime is 78140221. The reversal of 78140220 is 2204187.

It is a super-2 number, since 2×78140220² = 12211787963296800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78140221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1977 + ... + 12656.

It is an arithmetic number, because the mean of its divisors is an integer number (4609710).

Almost surely, 2^78140220 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 78140220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110633040).

78140220 is an abundant number, since it is smaller than the sum of its proper divisors (143125860).

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

78140220 is a wasteful number, since it uses less digits than its factorization.

78140220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14734 (or 14732 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 78140220 is about 8839.6956961199. The cubic root of 78140220 is about 427.5217457561.

The spelling of 78140220 in words is "seventy-eight million, one hundred forty thousand, two hundred twenty".