78620544 has 80 divisors (see below), whose sum is σ = 234004320. Its totient is φ = 26203392.

The previous prime is 78620527. The next prime is 78620569. The reversal of 78620544 is 44502687.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 78620499 and 78620508.

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 9 ways as a sum of consecutive naturals, for example, 6577 + ... + 14159.

It is an arithmetic number, because the mean of its divisors is an integer number (2925054).

Almost surely, 2^78620544 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 78620544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117002160).

78620544 is an abundant number, since it is smaller than the sum of its proper divisors (155383776).

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

78620544 is an equidigital number, since it uses as much as digits as its factorization.

78620544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7609 (or 7588 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 78620544 is about 8866.8226552695. The cubic root of 78620544 is about 428.3959418677.

The spelling of 78620544 in words is "seventy-eight million, six hundred twenty thousand, five hundred forty-four".