671920245 has 32 divisors (see below), whose sum is σ = 1197248640. Its totient is φ = 357540480.

The previous prime is 671920241. The next prime is 671920247. The reversal of 671920245 is 542029176.

It is not a de Polignac number, because 671920245 - 2² = 671920241 is a prime.

It is a super-4 number, since 4×671920245⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671920241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56250 + ... + 67140.

It is an arithmetic number, because the mean of its divisors is an integer number (37414020).

Almost surely, 2^671920245 is an apocalyptic number.

It is an amenable number.

671920245 is a deficient number, since it is larger than the sum of its proper divisors (525328395).

671920245 is a wasteful number, since it uses less digits than its factorization.

671920245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11362 (or 11356 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 671920245 is about 25921.4244400264. The cubic root of 671920245 is about 875.8691749649.

The spelling of 671920245 in words is "six hundred seventy-one million, nine hundred twenty thousand, two hundred forty-five".