686477440 has 64 divisors (see below), whose sum is σ = 1790320320. Its totient is φ = 249625600.

The previous prime is 686477437. The next prime is 686477443. The reversal of 686477440 is 44774686.

It is an interprime number because it is at equal distance from previous prime (686477437) and next prime (686477443).

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (686477443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41716 + ... + 55795.

It is an arithmetic number, because the mean of its divisors is an integer number (27973755).

Almost surely, 2^686477440 is an apocalyptic number.

It is an amenable number.

686477440 is an abundant number, since it is smaller than the sum of its proper divisors (1103842880).

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

686477440 is a wasteful number, since it uses less digits than its factorization.

686477440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97541 (or 97529 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 46.

The square root of 686477440 is about 26200.7144940744. The cubic root of 686477440 is about 882.1492917999.

The spelling of 686477440 in words is "six hundred eighty-six million, four hundred seventy-seven thousand, four hundred forty".