78328621 has 8 divisors (see below), whose sum is σ = 94230080. Its totient is φ = 63605088.

The previous prime is 78328619. The next prime is 78328643. The reversal of 78328621 is 12682387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78328621 - 2¹ = 78328619 is a prime.

It is a super-2 number, since 2×78328621² = 12270745735523282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78328021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294336 + ... + 294601.

It is an arithmetic number, because the mean of its divisors is an integer number (11778760).

Almost surely, 2^78328621 is an apocalyptic number.

It is an amenable number.

78328621 is a deficient number, since it is larger than the sum of its proper divisors (15901459).

78328621 is a wasteful number, since it uses less digits than its factorization.

78328621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588963.

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

The square root of 78328621 is about 8850.3458124528. The cubic root of 78328621 is about 427.8650639498.

The spelling of 78328621 in words is "seventy-eight million, three hundred twenty-eight thousand, six hundred twenty-one".