491394064 has 40 divisors (see below), whose sum is σ = 1090297280. Its totient is φ = 210169728.

The previous prime is 491394049. The next prime is 491394089. The reversal of 491394064 is 460493194.

It is a super-2 number, since 2×491394064² = 482936252268872192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54382 + ... + 62770.

It is an arithmetic number, because the mean of its divisors is an integer number (27257432).

Almost surely, 2^491394064 is an apocalyptic number.

It is an amenable number.

491394064 is an abundant number, since it is smaller than the sum of its proper divisors (598903216).

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

491394064 is a wasteful number, since it uses less digits than its factorization.

491394064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8927 (or 8921 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 491394064 is about 22167.4099524505. The cubic root of 491394064 is about 789.1204567950.

The spelling of 491394064 in words is "four hundred ninety-one million, three hundred ninety-four thousand, sixty-four".