678542145 has 32 divisors (see below), whose sum is σ = 1126984320. Its totient is φ = 348203520.

The previous prime is 678542099. The next prime is 678542153. The reversal of 678542145 is 541245876.

It is a happy number.

It is not a de Polignac number, because 678542145 - 2¹⁰ = 678541121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678542097 and 678542106.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131005 + ... + 136085.

It is an arithmetic number, because the mean of its divisors is an integer number (35218260).

Almost surely, 2^678542145 is an apocalyptic number.

It is an amenable number.

678542145 is a deficient number, since it is larger than the sum of its proper divisors (448442175).

678542145 is a wasteful number, since it uses less digits than its factorization.

678542145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425.

The product of its digits is 268800, while the sum is 42.

The square root of 678542145 is about 26048.8415289433. The cubic root of 678542145 is about 878.7370592991.

The spelling of 678542145 in words is "six hundred seventy-eight million, five hundred forty-two thousand, one hundred forty-five".