78535340 has 72 divisors (see below), whose sum is σ = 185993808. Its totient is φ = 27688320.

The previous prime is 78535309. The next prime is 78535343. The reversal of 78535340 is 4353587.

It is a self number, because there is not a number n which added to its sum of digits gives 78535340.

It is not an unprimeable number, because it can be changed into a prime (78535343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137255 + ... + 137825.

Almost surely, 2^78535340 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 78535340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92996904).

78535340 is an abundant number, since it is smaller than the sum of its proper divisors (107458468).

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

78535340 is a wasteful number, since it uses less digits than its factorization.

78535340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 78535340 is about 8862.0167005033. The cubic root of 78535340 is about 428.2411297378.

The spelling of 78535340 in words is "seventy-eight million, five hundred thirty-five thousand, three hundred forty".