78722380 has 24 divisors (see below), whose sum is σ = 180346320. Its totient is φ = 28626240.

The previous prime is 78722351. The next prime is 78722389. The reversal of 78722380 is 8322787.

It is a super-2 number, since 2×78722380² = 12394426225728800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78722389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178695 + ... + 179134.

It is an arithmetic number, because the mean of its divisors is an integer number (7514430).

Almost surely, 2^78722380 is an apocalyptic number.

It is an amenable number.

78722380 is an abundant number, since it is smaller than the sum of its proper divisors (101623940).

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

78722380 is a wasteful number, since it uses less digits than its factorization.

78722380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357849 (or 357847 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 78722380 is about 8872.5633274719. The cubic root of 78722380 is about 428.5808269897.

The spelling of 78722380 in words is "seventy-eight million, seven hundred twenty-two thousand, three hundred eighty".