78421693 has 8 divisors (see below), whose sum is σ = 89717760. Its totient is φ = 67148880.

The previous prime is 78421669. The next prime is 78421757. The reversal of 78421693 is 39612487.

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 78421693 - 2⁹ = 78421181 is a prime.

It is a super-2 number, since 2×78421693² = 12299923865972498, 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 (78421393) 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, 2148 + ... + 12706.

It is an arithmetic number, because the mean of its divisors is an integer number (11214720).

Almost surely, 2^78421693 is an apocalyptic number.

It is an amenable number.

78421693 is a deficient number, since it is larger than the sum of its proper divisors (11296067).

78421693 is a wasteful number, since it uses less digits than its factorization.

78421693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11627.

The product of its digits is 72576, while the sum is 40.

The square root of 78421693 is about 8855.6023510544. The cubic root of 78421693 is about 428.0344634810.

The spelling of 78421693 in words is "seventy-eight million, four hundred twenty-one thousand, six hundred ninety-three".