78427381 has 8 divisors (see below), whose sum is σ = 79835328. Its totient is φ = 77028000.

The previous prime is 78427361. The next prime is 78427387. The reversal of 78427381 is 18372487.

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 78427381 - 2⁷ = 78427253 is a prime.

It is a super-2 number, since 2×78427381² = 12301708181038322, 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 (78427387) 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, 17986 + ... + 21916.

It is an arithmetic number, because the mean of its divisors is an integer number (9979416).

Almost surely, 2^78427381 is an apocalyptic number.

78427381 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

78427381 is a deficient number, since it is larger than the sum of its proper divisors (1407947).

78427381 is a wasteful number, since it uses less digits than its factorization.

78427381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4283.

The product of its digits is 75264, while the sum is 40.

The square root of 78427381 is about 8855.9234978629. The cubic root of 78427381 is about 428.0448118131.

The spelling of 78427381 in words is "seventy-eight million, four hundred twenty-seven thousand, three hundred eighty-one".