78621382 has 24 divisors (see below), whose sum is σ = 138288384. Its totient is φ = 33424272.

The previous prime is 78621377. The next prime is 78621397. The reversal of 78621382 is 28312687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9288 + ... + 15604.

It is an arithmetic number, because the mean of its divisors is an integer number (5762016).

Almost surely, 2^78621382 is an apocalyptic number.

78621382 is a deficient number, since it is larger than the sum of its proper divisors (59667002).

78621382 is a wasteful number, since it uses less digits than its factorization.

78621382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6460 (or 6453 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 78621382 is about 8866.8699099513. The cubic root of 78621382 is about 428.3974639234.

It can be divided in two parts, 78621 and 382, that added together give a triangular number (79003 = T₃₉₇).

The spelling of 78621382 in words is "seventy-eight million, six hundred twenty-one thousand, three hundred eighty-two".