78135745 has 8 divisors (see below), whose sum is σ = 94060584. Its totient is φ = 62310144.

The previous prime is 78135719. The next prime is 78135763. The reversal of 78135745 is 54753187.

It can be written as a sum of positive squares in 4 ways, for example, as 5340721 + 72795024 = 2311^2 + 8532^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78135745 is a prime.

It is a super-2 number, since 2×78135745² = 12210389293410050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78135698 and 78135707.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23064 + ... + 26233.

It is an arithmetic number, because the mean of its divisors is an integer number (11757573).

Almost surely, 2^78135745 is an apocalyptic number.

It is an amenable number.

78135745 is a deficient number, since it is larger than the sum of its proper divisors (15924839).

78135745 is a wasteful number, since it uses less digits than its factorization.

78135745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49619.

The product of its digits is 117600, while the sum is 40.

The square root of 78135745 is about 8839.4425729228. The cubic root of 78135745 is about 427.5135843751.

The spelling of 78135745 in words is "seventy-eight million, one hundred thirty-five thousand, seven hundred forty-five".