78648340 has 24 divisors (see below), whose sum is σ = 165830112. Its totient is φ = 31332000.

The previous prime is 78648331. The next prime is 78648359. The reversal of 78648340 is 4384687.

It is a super-2 number, since 2×78648340² = 12371122769511200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78648293 and 78648302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2814 + ... + 12853.

It is an arithmetic number, because the mean of its divisors is an integer number (6909588).

Almost surely, 2^78648340 is an apocalyptic number.

It is an amenable number.

78648340 is an abundant number, since it is smaller than the sum of its proper divisors (87181772).

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

78648340 is a wasteful number, since it uses less digits than its factorization.

78648340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15927 (or 15925 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 78648340 is about 8868.3899327894. The cubic root of 78648340 is about 428.4464218482.

The spelling of 78648340 in words is "seventy-eight million, six hundred forty-eight thousand, three hundred forty".