78306536 has 64 divisors (see below), whose sum is σ = 191047680. Its totient is φ = 29177280.

The previous prime is 78306523. The next prime is 78306577. The reversal of 78306536 is 63560387.

It is a super-2 number, since 2×78306536² = 12263827160638592, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78306536.

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, 11405 + ... + 16931.

It is an arithmetic number, because the mean of its divisors is an integer number (2985120).

Almost surely, 2^78306536 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 78306536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95523840).

78306536 is an abundant number, since it is smaller than the sum of its proper divisors (112741144).

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

78306536 is a wasteful number, since it uses less digits than its factorization.

78306536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5574 (or 5570 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 78306536 is about 8849.0980331331. The cubic root of 78306536 is about 427.8248475382.

The spelling of 78306536 in words is "seventy-eight million, three hundred six thousand, five hundred thirty-six".