78753881 has 4 divisors (see below), whose sum is σ = 79450932. Its totient is φ = 78056832.

The previous prime is 78753833. The next prime is 78753893. The reversal of 78753881 is 18835787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18835787 = 257 ⋅73291.

It can be written as a sum of positive squares in 2 ways, for example, as 5480281 + 73273600 = 2341^2 + 8560^2 .

It is a cyclic number.

It is not a de Polignac number, because 78753881 - 2¹⁴ = 78737497 is a prime.

It is a super-2 number, since 2×78753881² = 12404347545124322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78752881) 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, 348356 + ... + 348581.

It is an arithmetic number, because the mean of its divisors is an integer number (19862733).

Almost surely, 2^78753881 is an apocalyptic number.

It is an amenable number.

78753881 is a deficient number, since it is larger than the sum of its proper divisors (697051).

78753881 is a wasteful number, since it uses less digits than its factorization.

78753881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697050.

The product of its digits is 376320, while the sum is 47.

The square root of 78753881 is about 8874.3383415328. The cubic root of 78753881 is about 428.6379853405.

The spelling of 78753881 in words is "seventy-eight million, seven hundred fifty-three thousand, eight hundred eighty-one".