78135240 has 32 divisors (see below), whose sum is σ = 234406080. Its totient is φ = 20836032.

The previous prime is 78135229. The next prime is 78135241. The reversal of 78135240 is 4253187.

It is a super-2 number, since 2×78135240² = 12210231459715200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 78135198 and 78135207.

It is not an unprimeable number, because it can be changed into a prime (78135241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325444 + ... + 325683.

It is an arithmetic number, because the mean of its divisors is an integer number (7325190).

Almost surely, 2^78135240 is an apocalyptic number.

It is an amenable number.

78135240 is an abundant number, since it is smaller than the sum of its proper divisors (156270840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78135240 is a wasteful number, since it uses less digits than its factorization.

78135240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651141 (or 651137 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 78135240 is about 8839.4140077270. The cubic root of 78135240 is about 427.5126633505.

The spelling of 78135240 in words is "seventy-eight million, one hundred thirty-five thousand, two hundred forty".