78883681 has 4 divisors (see below), whose sum is σ = 79062192. Its totient is φ = 78705172.

The previous prime is 78883669. The next prime is 78883691. The reversal of 78883681 is 18638887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78883681 - 2¹¹ = 78881633 is a prime.

It is a super-2 number, since 2×78883681² = 12445270256219522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78883661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88591 + ... + 89476.

It is an arithmetic number, because the mean of its divisors is an integer number (19765548).

Almost surely, 2^78883681 is an apocalyptic number.

It is an amenable number.

78883681 is a deficient number, since it is larger than the sum of its proper divisors (178511).

78883681 is a wasteful number, since it uses less digits than its factorization.

78883681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178510.

The product of its digits is 516096, while the sum is 49.

The square root of 78883681 is about 8881.6485519300. The cubic root of 78883681 is about 428.8733458974.

The spelling of 78883681 in words is "seventy-eight million, eight hundred eighty-three thousand, six hundred eighty-one".