78632421 has 8 divisors (see below), whose sum is σ = 119820864. Its totient is φ = 44932800.

The previous prime is 78632419. The next prime is 78632441. The reversal of 78632421 is 12423687.

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

It is not a de Polignac number, because 78632421 - 2¹ = 78632419 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78632401) 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, 1872180 + ... + 1872221.

It is an arithmetic number, because the mean of its divisors is an integer number (14977608).

Almost surely, 2^78632421 is an apocalyptic number.

It is an amenable number.

78632421 is a deficient number, since it is larger than the sum of its proper divisors (41188443).

78632421 is a wasteful number, since it uses less digits than its factorization.

78632421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3744411.

The product of its digits is 16128, while the sum is 33.

The square root of 78632421 is about 8867.4923738338. The cubic root of 78632421 is about 428.4175129998.

The spelling of 78632421 in words is "seventy-eight million, six hundred thirty-two thousand, four hundred twenty-one".