78523746 has 32 divisors (see below), whose sum is σ = 183306240. Its totient is φ = 21957456.

The previous prime is 78523723. The next prime is 78523759. The reversal of 78523746 is 64732587.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78523698 and 78523707.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 17916 + ... + 21863.

It is an arithmetic number, because the mean of its divisors is an integer number (5728320).

Almost surely, 2^78523746 is an apocalyptic number.

78523746 is an abundant number, since it is smaller than the sum of its proper divisors (104782494).

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

78523746 is a wasteful number, since it uses less digits than its factorization.

78523746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39838.

The product of its digits is 282240, while the sum is 42.

The square root of 78523746 is about 8861.3625363146. The cubic root of 78523746 is about 428.2200552678.

It can be divided in two parts, 785 and 23746, that added together give a triangular number (24531 = T₂₂₁).

The spelling of 78523746 in words is "seventy-eight million, five hundred twenty-three thousand, seven hundred forty-six".