671417778 has 16 divisors (see below), whose sum is σ = 1386153216. Its totient is φ = 216586320.

The previous prime is 671417759. The next prime is 671417779. The reversal of 671417778 is 877714176.

It is a super-2 number, since 2×671417778² = 901603665228914568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671417779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1804701 + ... + 1805072.

It is an arithmetic number, because the mean of its divisors is an integer number (86634576).

Almost surely, 2^671417778 is an apocalyptic number.

671417778 is an abundant number, since it is smaller than the sum of its proper divisors (714735438).

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

671417778 is a wasteful number, since it uses less digits than its factorization.

671417778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609809.

The product of its digits is 460992, while the sum is 48.

The square root of 671417778 is about 25911.7305095588. The cubic root of 671417778 is about 875.6507933401.

The spelling of 671417778 in words is "six hundred seventy-one million, four hundred seventeen thousand, seven hundred seventy-eight".