678261905 has 16 divisors (see below), whose sum is σ = 857848320. Its totient is φ = 513393408.

The previous prime is 678261839. The next prime is 678261953. The reversal of 678261905 is 509162876.

It is a cyclic number.

It is not a de Polignac number, because 678261905 - 2¹² = 678257809 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77849 + ... + 86121.

It is an arithmetic number, because the mean of its divisors is an integer number (53615520).

Almost surely, 2^678261905 is an apocalyptic number.

It is an amenable number.

678261905 is a deficient number, since it is larger than the sum of its proper divisors (179586415).

678261905 is a wasteful number, since it uses less digits than its factorization.

678261905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9160.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 678261905 is about 26043.4618474580. The cubic root of 678261905 is about 878.6160689353.

The spelling of 678261905 in words is "six hundred seventy-eight million, two hundred sixty-one thousand, nine hundred five".