681526487 has 8 divisors (see below), whose sum is σ = 689256432. Its totient is φ = 673816000.

The previous prime is 681526471. The next prime is 681526493. The reversal of 681526487 is 784625186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681526487 - 2⁴ = 681526471 is a prime.

It is a super-2 number, since 2×681526487² = 928956704965122338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681526457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72428 + ... + 81294.

It is an arithmetic number, because the mean of its divisors is an integer number (86157054).

Almost surely, 2^681526487 is an apocalyptic number.

681526487 is a deficient number, since it is larger than the sum of its proper divisors (7729945).

681526487 is a wasteful number, since it uses less digits than its factorization.

681526487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9729.

The product of its digits is 645120, while the sum is 47.

The square root of 681526487 is about 26106.0622653054. The cubic root of 681526487 is about 880.0234528013.

The spelling of 681526487 in words is "six hundred eighty-one million, five hundred twenty-six thousand, four hundred eighty-seven".