78105280 has 56 divisors (see below), whose sum is σ = 202905360. Its totient is φ = 28400640.

The previous prime is 78105277. The next prime is 78105281. The reversal of 78105280 is 8250187.

It is a super-2 number, since 2×78105280² = 12200869527756800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78105281) 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, 7575 + ... + 14614.

It is an arithmetic number, because the mean of its divisors is an integer number (3623310).

Almost surely, 2^78105280 is an apocalyptic number.

It is an amenable number.

78105280 is an abundant number, since it is smaller than the sum of its proper divisors (124800080).

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

78105280 is a wasteful number, since it uses less digits than its factorization.

78105280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22217 (or 22207 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 78105280 is about 8837.7191627704. The cubic root of 78105280 is about 427.4580148683.

The spelling of 78105280 in words is "seventy-eight million, one hundred five thousand, two hundred eighty".