78576421 has 16 divisors (see below), whose sum is σ = 98293248. Its totient is φ = 61023600.

The previous prime is 78576403. The next prime is 78576439. The reversal of 78576421 is 12467587.

It is an interprime number because it is at equal distance from previous prime (78576403) and next prime (78576439).

It is not a de Polignac number, because 78576421 - 2⁹ = 78575909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78576401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23946 + ... + 27028.

It is an arithmetic number, because the mean of its divisors is an integer number (6143328).

Almost surely, 2^78576421 is an apocalyptic number.

It is an amenable number.

78576421 is a deficient number, since it is larger than the sum of its proper divisors (19716827).

78576421 is a wasteful number, since it uses less digits than its factorization.

78576421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432.

The product of its digits is 94080, while the sum is 40.

The square root of 78576421 is about 8864.3342107572. The cubic root of 78576421 is about 428.3157861801.

The spelling of 78576421 in words is "seventy-eight million, five hundred seventy-six thousand, four hundred twenty-one".