678895657 has 16 divisors (see below), whose sum is σ = 764040384. Its totient is φ = 597960000.

The previous prime is 678895643. The next prime is 678895667. The reversal of 678895657 is 756598876.

It is not a de Polignac number, because 678895657 - 2¹¹ = 678893609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678895595 and 678895604.

It is not an unprimeable number, because it can be changed into a prime (678895667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37407 + ... + 52507.

It is an arithmetic number, because the mean of its divisors is an integer number (47752524).

Almost surely, 2^678895657 is an apocalyptic number.

678895657 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

678895657 is a deficient number, since it is larger than the sum of its proper divisors (85144727).

678895657 is a wasteful number, since it uses less digits than its factorization.

678895657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15240.

The product of its digits is 25401600, while the sum is 61.

The square root of 678895657 is about 26055.6262062534. The cubic root of 678895657 is about 878.8896364903.

The spelling of 678895657 in words is "six hundred seventy-eight million, eight hundred ninety-five thousand, six hundred fifty-seven".