678650531 has 32 divisors (see below), whose sum is σ = 801239040. Its totient is φ = 569372544.

The previous prime is 678650507. The next prime is 678650597. The reversal of 678650531 is 135056876.

It is not a de Polignac number, because 678650531 - 2²² = 674456227 is a prime.

It is a super-2 number, since 2×678650531² = 921133086453163922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678650501) 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, 614726 + ... + 615828.

It is an arithmetic number, because the mean of its divisors is an integer number (25038720).

Almost surely, 2^678650531 is an apocalyptic number.

678650531 is a deficient number, since it is larger than the sum of its proper divisors (122588509).

678650531 is a wasteful number, since it uses less digits than its factorization.

678650531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 678650531 is about 26050.9218838797. The cubic root of 678650531 is about 878.7838447616.

The spelling of 678650531 in words is "six hundred seventy-eight million, six hundred fifty thousand, five hundred thirty-one".