678057139 has 4 divisors (see below), whose sum is σ = 694595160. Its totient is φ = 661519120.

The previous prime is 678057103. The next prime is 678057157. The reversal of 678057139 is 931750876.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678057139 - 2¹⁹ = 677532851 is a prime.

It is a super-2 number, since 2×678057139² = 919522967497730642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678057169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8268949 + ... + 8269030.

It is an arithmetic number, because the mean of its divisors is an integer number (173648790).

Almost surely, 2^678057139 is an apocalyptic number.

678057139 is a deficient number, since it is larger than the sum of its proper divisors (16538021).

678057139 is a wasteful number, since it uses less digits than its factorization.

678057139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16538020.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 678057139 is about 26039.5303145045. The cubic root of 678057139 is about 878.5276425204.

The spelling of 678057139 in words is "six hundred seventy-eight million, fifty-seven thousand, one hundred thirty-nine".