687136663020 has 48 divisors (see below), whose sum is σ = 1924068208608. Its totient is φ = 183228295680.

The previous prime is 687136662991. The next prime is 687136663027. The reversal of 687136663020 is 20366631786.

It is a happy number.

It is a super-2 number, since 2×687136663020² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (687136663027) 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, 1172032 + ... + 1657688.

It is an arithmetic number, because the mean of its divisors is an integer number (40084754346).

Almost surely, 2^687136663020 is an apocalyptic number.

687136663020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

687136663020 is an abundant number, since it is smaller than the sum of its proper divisors (1236931545588).

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

687136663020 is a wasteful number, since it uses less digits than its factorization.

687136663020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509250 (or 509248 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 48.

The spelling of 687136663020 in words is "six hundred eighty-seven billion, one hundred thirty-six million, six hundred sixty-three thousand, twenty".