671874905 has 16 divisors (see below), whose sum is σ = 884656080. Its totient is φ = 486789888.

The previous prime is 671874899. The next prime is 671874911. The reversal of 671874905 is 509478176.

It is an interprime number because it is at equal distance from previous prime (671874899) and next prime (671874911).

It can be written as a sum of positive squares in 8 ways, for example, as 61340224 + 610534681 = 7832^2 + 24709^2 .

It is not a de Polignac number, because 671874905 - 2²⁴ = 655097689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 671874905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94070 + ... + 100959.

It is an arithmetic number, because the mean of its divisors is an integer number (55291005).

Almost surely, 2^671874905 is an apocalyptic number.

671874905 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

671874905 is a deficient number, since it is larger than the sum of its proper divisors (212781175).

671874905 is a wasteful number, since it uses less digits than its factorization.

671874905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195100.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 671874905 is about 25920.5498591369. The cubic root of 671874905 is about 875.8494738163.

The spelling of 671874905 in words is "six hundred seventy-one million, eight hundred seventy-four thousand, nine hundred five".