78738140 has 48 divisors (see below), whose sum is σ = 183832320. Its totient is φ = 28131840.

The previous prime is 78738139. The next prime is 78738151. The reversal of 78738140 is 4183787.

It is a junction number, because it is equal to n+sod(n) for n = 78738094 and 78738103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3176 + ... + 12944.

It is an arithmetic number, because the mean of its divisors is an integer number (3829840).

Almost surely, 2^78738140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78738140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91916160).

78738140 is an abundant number, since it is smaller than the sum of its proper divisors (105094180).

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

78738140 is a wasteful number, since it uses less digits than its factorization.

78738140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9822 (or 9820 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 78738140 is about 8873.4514141905. The cubic root of 78738140 is about 428.6094253084.

The spelling of 78738140 in words is "seventy-eight million, seven hundred thirty-eight thousand, one hundred forty".