78317240 has 32 divisors (see below), whose sum is σ = 185490000. Its totient is φ = 29677824.

The previous prime is 78317237. The next prime is 78317243. The reversal of 78317240 is 4271387.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78317237) and next prime (78317243).

It is a super-2 number, since 2×78317240² = 12267180162435200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78317197 and 78317206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78317243) 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, 50765 + ... + 52284.

Almost surely, 2^78317240 is an apocalyptic number.

It is an amenable number.

78317240 is an abundant number, since it is smaller than the sum of its proper divisors (107172760).

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

78317240 is a wasteful number, since it uses less digits than its factorization.

78317240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103079 (or 103075 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 78317240 is about 8849.7028198692. The cubic root of 78317240 is about 427.8443402854.

The spelling of 78317240 in words is "seventy-eight million, three hundred seventeen thousand, two hundred forty".