491526638 has 8 divisors (see below), whose sum is σ = 761073600. Its totient is φ = 237835440.

The previous prime is 491526613. The next prime is 491526643. The reversal of 491526638 is 836625194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3963863 + ... + 3963986.

It is an arithmetic number, because the mean of its divisors is an integer number (95134200).

Almost surely, 2^491526638 is an apocalyptic number.

491526638 is a deficient number, since it is larger than the sum of its proper divisors (269546962).

491526638 is a wasteful number, since it uses less digits than its factorization.

491526638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7927882.

The product of its digits is 311040, while the sum is 44.

The square root of 491526638 is about 22170.4000414968. The cubic root of 491526638 is about 789.1914164424.

The spelling of 491526638 in words is "four hundred ninety-one million, five hundred twenty-six thousand, six hundred thirty-eight".