78380775 has 54 divisors (see below), whose sum is σ = 154365120. Its totient is φ = 37989600.

The previous prime is 78380773. The next prime is 78380779. The reversal of 78380775 is 57708387.

It is not a de Polignac number, because 78380775 - 2¹ = 78380773 is a prime.

It is a super-2 number, since 2×78380775² = 12287091779201250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78380775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78380773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 25786 + ... + 28664.

Almost surely, 2^78380775 is an apocalyptic number.

78380775 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78380775 is a deficient number, since it is larger than the sum of its proper divisors (75984345).

78380775 is a wasteful number, since it uses less digits than its factorization.

78380775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2917 (or 2898 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 78380775 is about 8853.2917606956. The cubic root of 78380775 is about 427.9600055067.

The spelling of 78380775 in words is "seventy-eight million, three hundred eighty thousand, seven hundred seventy-five".