686512464 has 80 divisors (see below), whose sum is σ = 2018870784. Its totient is φ = 198985600.

The previous prime is 686512457. The next prime is 686512471. The reversal of 686512464 is 464215686.

686512464 = T₁₉ + T₂₀ + ... + T₁₆₀₂.

It is an interprime number because it is at equal distance from previous prime (686512457) and next prime (686512471).

It is a congruent number.

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, 16122 + ... + 40409.

Almost surely, 2^686512464 is an apocalyptic number.

It is an amenable number.

686512464 is an abundant number, since it is smaller than the sum of its proper divisors (1332358320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686512464 is a wasteful number, since it uses less digits than its factorization.

686512464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56576 (or 56570 counting only the distinct ones).

The product of its digits is 276480, while the sum is 42.

The square root of 686512464 is about 26201.3828642688. The cubic root of 686512464 is about 882.1642939299.

The spelling of 686512464 in words is "six hundred eighty-six million, five hundred twelve thousand, four hundred sixty-four".