78355387 has 16 divisors (see below), whose sum is σ = 88833024. Its totient is φ = 68488000.

The previous prime is 78355349. The next prime is 78355391.

78355387 is nontrivially palindromic in base 10.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78355387 is a prime.

It is a super-2 number, since 2×78355387² = 12279133343839538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78352387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30798 + ... + 33244.

It is an arithmetic number, because the mean of its divisors is an integer number (5552064).

Almost surely, 2^78355387 is an apocalyptic number.

78355387 is a deficient number, since it is larger than the sum of its proper divisors (10477637).

78355387 is a wasteful number, since it uses less digits than its factorization.

78355387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570.

The product of its digits is 705600, while the sum is 46.

The square root of 78355387 is about 8851.8578275975. The cubic root of 78355387 is about 427.9137942518.

The spelling of 78355387 in words is "seventy-eight million, three hundred fifty-five thousand, three hundred eighty-seven".