671275980 has 36 divisors (see below), whose sum is σ = 2036204352. Its totient is φ = 179006880.

The previous prime is 671275973. The next prime is 671275993. The reversal of 671275980 is 89572176.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×671275980² = 901222882649920800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1864476 + ... + 1864835.

It is an arithmetic number, because the mean of its divisors is an integer number (56561232).

Almost surely, 2^671275980 is an apocalyptic number.

671275980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

671275980 is an abundant number, since it is smaller than the sum of its proper divisors (1364928372).

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

671275980 is a wasteful number, since it uses less digits than its factorization.

671275980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3729326 (or 3729321 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 671275980 is about 25908.9941912070. The cubic root of 671275980 is about 875.5891455468.

The spelling of 671275980 in words is "six hundred seventy-one million, two hundred seventy-five thousand, nine hundred eighty".