78135402 has 8 divisors (see below), whose sum is σ = 156270816. Its totient is φ = 26045132.

The previous prime is 78135377. The next prime is 78135419. The reversal of 78135402 is 20453187.

It is a sphenic number, since it is the product of 3 distinct primes.

78135402 is an admirable number.

It is a super-2 number, since 2×78135402² = 12210282091403208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78135402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6511278 + ... + 6511289.

It is an arithmetic number, because the mean of its divisors is an integer number (19533852).

Almost surely, 2^78135402 is an apocalyptic number.

78135402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78135402 is a wasteful number, since it uses less digits than its factorization.

78135402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13022572.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 78135402 is about 8839.4231712256. The cubic root of 78135402 is about 427.5129588083.

Adding to 78135402 its reverse (20453187), we get a palindrome (98588589).

The spelling of 78135402 in words is "seventy-eight million, one hundred thirty-five thousand, four hundred two".