671390550 has 36 divisors (see below), whose sum is σ = 1803803820. Its totient is φ = 179037360.

The previous prime is 671390509. The next prime is 671390579. The reversal of 671390550 is 55093176.

It is a happy number.

671390550 is a `hidden beast` number, since 6 + 7 + 13 + 90 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 745540 + ... + 746439.

Almost surely, 2^671390550 is an apocalyptic number.

671390550 is an abundant number, since it is smaller than the sum of its proper divisors (1132413270).

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

671390550 is a wasteful number, since it uses less digits than its factorization.

671390550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491997 (or 1491989 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 36.

The square root of 671390550 is about 25911.2051051278. The cubic root of 671390550 is about 875.6389564267.

The spelling of 671390550 in words is "six hundred seventy-one million, three hundred ninety thousand, five hundred fifty".