78621084 has 96 divisors (see below), whose sum is σ = 219770880. Its totient is φ = 24235200.

The previous prime is 78621077. The next prime is 78621097. The reversal of 78621084 is 48012687.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76494 + ... + 77514.

It is an arithmetic number, because the mean of its divisors is an integer number (2289280).

Almost surely, 2^78621084 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 78621084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109885440).

78621084 is an abundant number, since it is smaller than the sum of its proper divisors (141149796).

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

78621084 is a wasteful number, since it uses less digits than its factorization.

78621084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088 (or 1080 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 78621084 is about 8866.8531058093. The cubic root of 78621084 is about 428.3969226685.

The spelling of 78621084 in words is "seventy-eight million, six hundred twenty-one thousand, eighty-four".