78217088 has 16 divisors (see below), whose sum is σ = 155823360. Its totient is φ = 39108480.

The previous prime is 78217081. The next prime is 78217099. The reversal of 78217088 is 88071287.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×78217088² = 12235825710399488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78217081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305408 + ... + 305663.

It is an arithmetic number, because the mean of its divisors is an integer number (9738960).

Almost surely, 2^78217088 is an apocalyptic number.

It is an amenable number.

78217088 is a deficient number, since it is larger than the sum of its proper divisors (77606272).

78217088 is an equidigital number, since it uses as much as digits as its factorization.

78217088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611085 (or 611073 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 78217088 is about 8844.0425145970. The cubic root of 78217088 is about 427.6618868663.

The spelling of 78217088 in words is "seventy-eight million, two hundred seventeen thousand, eighty-eight".