78135975 has 24 divisors (see below), whose sum is σ = 143539920. Its totient is φ = 41672160.

The previous prime is 78135943. The next prime is 78135979. The reversal of 78135975 is 57953187.

It is not a de Polignac number, because 78135975 - 2⁵ = 78135943 is a prime.

It is a super-2 number, since 2×78135975² = 12210461178401250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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 78135975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78135979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57204 + ... + 58553.

It is an arithmetic number, because the mean of its divisors is an integer number (5980830).

Almost surely, 2^78135975 is an apocalyptic number.

78135975 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78135975 is a deficient number, since it is larger than the sum of its proper divisors (65403945).

78135975 is a wasteful number, since it uses less digits than its factorization.

78135975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115776 (or 115765 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The square root of 78135975 is about 8839.4555827834. The cubic root of 78135975 is about 427.5140038503.

The spelling of 78135975 in words is "seventy-eight million, one hundred thirty-five thousand, nine hundred seventy-five".