78891750 has 96 divisors (see below), whose sum is σ = 243846720. Its totient is φ = 18028800.

The previous prime is 78891739. The next prime is 78891797. The reversal of 78891750 is 5719887.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 78891696 and 78891705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13246 + ... + 18254.

It is an arithmetic number, because the mean of its divisors is an integer number (2540070).

Almost surely, 2^78891750 is an apocalyptic number.

78891750 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78891750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121923360).

78891750 is an abundant number, since it is smaller than the sum of its proper divisors (164954970).

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

78891750 is a wasteful number, since it uses less digits than its factorization.

78891750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039 (or 5026 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 78891750 is about 8882.1027915691. The cubic root of 78891750 is about 428.8879685291.

The spelling of 78891750 in words is "seventy-eight million, eight hundred ninety-one thousand, seven hundred fifty".