671527731820 has 48 divisors (see below), whose sum is σ = 1538476480800. Its totient is φ = 244181189120.

The previous prime is 671527731793. The next prime is 671527731829. The reversal of 671527731820 is 28137725176.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (671527731829) 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, 6355986 + ... + 6460774.

It is an arithmetic number, because the mean of its divisors is an integer number (32051593350).

Almost surely, 2^671527731820 is an apocalyptic number.

It is an amenable number.

671527731820 is an abundant number, since it is smaller than the sum of its proper divisors (866948748980).

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

671527731820 is a wasteful number, since it uses less digits than its factorization.

671527731820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133938 (or 133936 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 49.

The spelling of 671527731820 in words is "six hundred seventy-one billion, five hundred twenty-seven million, seven hundred thirty-one thousand, eight hundred twenty".