641987498 has 8 divisors (see below), whose sum is σ = 963352992. Its totient is φ = 320869836.

The previous prime is 641987491. The next prime is 641987503. The reversal of 641987498 is 894789146.

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

It is not an unprimeable number, because it can be changed into a prime (641987491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55340 + ... + 65927.

It is an arithmetic number, because the mean of its divisors is an integer number (120419124).

Almost surely, 2^641987498 is an apocalyptic number.

641987498 is a deficient number, since it is larger than the sum of its proper divisors (321365494).

641987498 is a wasteful number, since it uses less digits than its factorization.

641987498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123916.

The product of its digits is 3483648, while the sum is 56.

The square root of 641987498 is about 25337.4722101476. The cubic root of 641987498 is about 862.6650238882.

The spelling of 641987498 in words is "six hundred forty-one million, nine hundred eighty-seven thousand, four hundred ninety-eight".