78340539 has 32 divisors (see below), whose sum is σ = 114428160. Its totient is φ = 47480832.

The previous prime is 78340517. The next prime is 78340541. The reversal of 78340539 is 93504387.

It is not a de Polignac number, because 78340539 - 2⁷ = 78340411 is a prime.

It is a super-2 number, since 2×78340539² = 12274480101621042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78340497 and 78340506.

It is not an unprimeable number, because it can be changed into a prime (78340039) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 304699 + ... + 304955.

It is an arithmetic number, because the mean of its divisors is an integer number (3575880).

Almost surely, 2^78340539 is an apocalyptic number.

78340539 is a deficient number, since it is larger than the sum of its proper divisors (36087621).

78340539 is a wasteful number, since it uses less digits than its factorization.

78340539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 78340539 is about 8851.0190938671. The cubic root of 78340539 is about 427.8867632859.

The spelling of 78340539 in words is "seventy-eight million, three hundred forty thousand, five hundred thirty-nine".