78691336 has 8 divisors (see below), whose sum is σ = 147546270. Its totient is φ = 39345664.

The previous prime is 78691253. The next prime is 78691337. The reversal of 78691336 is 63319687.

It can be written as a sum of positive squares in only one way, i.e., 50495236 + 28196100 = 7106^2 + 5310^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78691336² = 12384652722929792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78691292 and 78691301.

It is not an unprimeable number, because it can be changed into a prime (78691337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4918201 + ... + 4918216.

Almost surely, 2^78691336 is an apocalyptic number.

It is an amenable number.

78691336 is a deficient number, since it is larger than the sum of its proper divisors (68854934).

78691336 is a wasteful number, since it uses less digits than its factorization.

78691336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9836423 (or 9836419 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The square root of 78691336 is about 8870.8137169033. The cubic root of 78691336 is about 428.5244829424.

The spelling of 78691336 in words is "seventy-eight million, six hundred ninety-one thousand, three hundred thirty-six".