78288522 has 32 divisors (see below), whose sum is σ = 173185152. Its totient is φ = 23436864.

The previous prime is 78288503. The next prime is 78288523. The reversal of 78288522 is 22588287.

It is a super-2 number, since 2×78288522² = 12258185353888968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78288523) 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, 10678 + ... + 16449.

It is an arithmetic number, because the mean of its divisors is an integer number (5412036).

Almost surely, 2^78288522 is an apocalyptic number.

78288522 is an abundant number, since it is smaller than the sum of its proper divisors (94896630).

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

78288522 is a wasteful number, since it uses less digits than its factorization.

78288522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27182.

The product of its digits is 143360, while the sum is 42.

The square root of 78288522 is about 8848.0801307402. The cubic root of 78288522 is about 427.7920387492.

The spelling of 78288522 in words is "seventy-eight million, two hundred eighty-eight thousand, five hundred twenty-two".