78421415 has 8 divisors (see below), whose sum is σ = 94234560. Its totient is φ = 62651232.

The previous prime is 78421411. The next prime is 78421429. The reversal of 78421415 is 51412487.

It is a happy number.

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 78421415 - 2² = 78421411 is a prime.

It is a super-2 number, since 2×78421415² = 12299836661204450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78421411) 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, 6575 + ... + 14144.

It is an arithmetic number, because the mean of its divisors is an integer number (11779320).

Almost surely, 2^78421415 is an apocalyptic number.

78421415 is a deficient number, since it is larger than the sum of its proper divisors (15813145).

78421415 is a wasteful number, since it uses less digits than its factorization.

78421415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21481.

The product of its digits is 8960, while the sum is 32.

The square root of 78421415 is about 8855.5866547621. The cubic root of 78421415 is about 428.0339576953.

The spelling of 78421415 in words is "seventy-eight million, four hundred twenty-one thousand, four hundred fifteen".