78487740 has 72 divisors (see below), whose sum is σ = 239868720. Its totient is φ = 20772864.

The previous prime is 78487699. The next prime is 78487757. The reversal of 78487740 is 4778487.

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

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 23452 + ... + 26588.

It is an arithmetic number, because the mean of its divisors is an integer number (3331510).

Almost surely, 2^78487740 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 78487740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119934360).

78487740 is an abundant number, since it is smaller than the sum of its proper divisors (161380980).

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

78487740 is a wasteful number, since it uses less digits than its factorization.

78487740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3291 (or 3286 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 45.

The square root of 78487740 is about 8859.3306744923. The cubic root of 78487740 is about 428.1545937595.

The spelling of 78487740 in words is "seventy-eight million, four hundred eighty-seven thousand, seven hundred forty".