78508412 has 6 divisors (see below), whose sum is σ = 137389728. Its totient is φ = 39254204.

The previous prime is 78508387. The next prime is 78508421. The reversal of 78508412 is 21480587.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9813548 + ... + 9813555.

It is an arithmetic number, because the mean of its divisors is an integer number (22898288).

Almost surely, 2^78508412 is an apocalyptic number.

It is an amenable number.

78508412 is a deficient number, since it is larger than the sum of its proper divisors (58881316).

78508412 is a wasteful number, since it uses less digits than its factorization.

78508412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19627107 (or 19627105 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 78508412 is about 8860.4972772413. The cubic root of 78508412 is about 428.1921793953.

Adding to 78508412 its reverse (21480587), we get a palindrome (99988999).

The spelling of 78508412 in words is "seventy-eight million, five hundred eight thousand, four hundred twelve".