78426740 has 24 divisors (see below), whose sum is σ = 188224512. Its totient is φ = 26889120.

The previous prime is 78426739. The next prime is 78426743. The reversal of 78426740 is 4762487.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78426694 and 78426703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78426743) 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 in 7 ways as a sum of consecutive naturals, for example, 279956 + ... + 280235.

It is an arithmetic number, because the mean of its divisors is an integer number (7842688).

Almost surely, 2^78426740 is an apocalyptic number.

78426740 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78426740 is an abundant number, since it is smaller than the sum of its proper divisors (109797772).

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

78426740 is a wasteful number, since it uses less digits than its factorization.

78426740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560207 (or 560205 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 78426740 is about 8855.8873073227. The cubic root of 78426740 is about 428.0436456495.

The spelling of 78426740 in words is "seventy-eight million, four hundred twenty-six thousand, seven hundred forty".