78818740 has 192 divisors, whose sum is σ = 231211008. Its totient is φ = 21772800.

The previous prime is 78818737. The next prime is 78818741. The reversal of 78818740 is 4781887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78818741) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 620557 + ... + 620683.

It is an arithmetic number, because the mean of its divisors is an integer number (1204224).

Almost surely, 2^78818740 is an apocalyptic number.

78818740 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78818740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115605504).

78818740 is an abundant number, since it is smaller than the sum of its proper divisors (152392268).

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

78818740 is a wasteful number, since it uses less digits than its factorization.

78818740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 43.

The square root of 78818740 is about 8877.9918900616. The cubic root of 78818740 is about 428.7556235751.

It can be divided in two parts, 78 and 818740, that added together give a palindrome (818818).

The spelling of 78818740 in words is "seventy-eight million, eight hundred eighteen thousand, seven hundred forty".