671274765 has 36 divisors (see below), whose sum is σ = 1353513564. Its totient is φ = 306867456.

The previous prime is 671274761. The next prime is 671274781. The reversal of 671274765 is 567472176.

It can be written as a sum of positive squares in 2 ways, for example, as 92102409 + 579172356 = 9597^2 + 24066^2 .

It is not a de Polignac number, because 671274765 - 2² = 671274761 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 671274765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671274761) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 150012 + ... + 154421.

It is an arithmetic number, because the mean of its divisors is an integer number (37597599).

Almost surely, 2^671274765 is an apocalyptic number.

It is an amenable number.

671274765 is an abundant number, since it is smaller than the sum of its proper divisors (682238799).

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

671274765 is a wasteful number, since it uses less digits than its factorization.

671274765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304458 (or 304448 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 671274765 is about 25908.9707437405. The cubic root of 671274765 is about 875.5886172785.

The spelling of 671274765 in words is "six hundred seventy-one million, two hundred seventy-four thousand, seven hundred sixty-five".