640616498 has 4 divisors (see below), whose sum is σ = 960924750. Its totient is φ = 320308248.

The previous prime is 640616497. The next prime is 640616503. The reversal of 640616498 is 894616046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 550043209 + 90573289 = 23453^2 + 9517^2 .

It is not an unprimeable number, because it can be changed into a prime (640616497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160154123 + ... + 160154126.

Almost surely, 2^640616498 is an apocalyptic number.

640616498 is a deficient number, since it is larger than the sum of its proper divisors (320308252).

640616498 is a wasteful number, since it uses less digits than its factorization.

640616498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320308251.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 640616498 is about 25310.4029600479. The cubic root of 640616498 is about 862.0504965187.

The spelling of 640616498 in words is "six hundred forty million, six hundred sixteen thousand, four hundred ninety-eight".