78865536 has 64 divisors (see below), whose sum is σ = 213098400. Its totient is φ = 25842944.

The previous prime is 78865531. The next prime is 78865573. The reversal of 78865536 is 63556887.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×78865536³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

Its product of digits (1209600) is a multiple of the sum of its prime divisors (64).

It is not an unprimeable number, because it can be changed into a prime (78865531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1336675 + ... + 1336733.

Almost surely, 2^78865536 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 78865536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106549200).

78865536 is an abundant number, since it is smaller than the sum of its proper divisors (134232864).

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

78865536 is an frugal number, since it uses more digits than its factorization.

78865536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 64 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 48.

The square root of 78865536 is about 8880.6270048910. The cubic root of 78865536 is about 428.8404599084.

78865536 divided by its sum of digits (48) gives a cube (1643032 = 118³).

It can be divided in two parts, 78865 and 536, that added together give a triangular number (79401 = T₃₉₈).

The spelling of 78865536 in words is "seventy-eight million, eight hundred sixty-five thousand, five hundred thirty-six".