78380621 has 8 divisors (see below), whose sum is σ = 85670688. Its totient is φ = 71118000.

The previous prime is 78380597. The next prime is 78380623. The reversal of 78380621 is 12608387.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78380621 is a prime.

It is a super-2 number, since 2×78380621² = 12287043496691282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78380623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 635 + ... + 12536.

It is an arithmetic number, because the mean of its divisors is an integer number (10708836).

Almost surely, 2^78380621 is an apocalyptic number.

It is an amenable number.

78380621 is a deficient number, since it is larger than the sum of its proper divisors (7290067).

78380621 is a wasteful number, since it uses less digits than its factorization.

78380621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13723.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 78380621 is about 8853.2830633613. The cubic root of 78380621 is about 427.9597252259.

The spelling of 78380621 in words is "seventy-eight million, three hundred eighty thousand, six hundred twenty-one".