78312530 has 8 divisors (see below), whose sum is σ = 140962572. Its totient is φ = 31325008.

The previous prime is 78312511. The next prime is 78312571. The reversal of 78312530 is 3521387.

It can be written as a sum of positive squares in 2 ways, for example, as 78092569 + 219961 = 8837^2 + 469^2 .

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

It is a super-2 number, since 2×78312530² = 12265704710001800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78312493 and 78312502.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3915617 + ... + 3915636.

Almost surely, 2^78312530 is an apocalyptic number.

78312530 is a deficient number, since it is larger than the sum of its proper divisors (62650042).

78312530 is a wasteful number, since it uses less digits than its factorization.

78312530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7831260.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 78312530 is about 8849.4367052372. The cubic root of 78312530 is about 427.8357632584.

The spelling of 78312530 in words is "seventy-eight million, three hundred twelve thousand, five hundred thirty".