1640162898 has 32 divisors (see below), whose sum is σ = 3976153920. Its totient is φ = 497018880.

The previous prime is 1640162891. The next prime is 1640162903. The reversal of 1640162898 is 8982610461.

1640162898 is a `hidden beast` number, since 16 + 4 + 0 + 1 + 628 + 9 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1640162891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1380015 + ... + 1381202.

It is an arithmetic number, because the mean of its divisors is an integer number (124254810).

Almost surely, 2^1640162898 is an apocalyptic number.

1640162898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1640162898 is an abundant number, since it is smaller than the sum of its proper divisors (2335991022).

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

1640162898 is a wasteful number, since it uses less digits than its factorization.

1640162898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2761239 (or 2761233 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1640162898 is about 40498.9246523905. The cubic root of 1640162898 is about 1179.3127516869.

The spelling of 1640162898 in words is "one billion, six hundred forty million, one hundred sixty-two thousand, eight hundred ninety-eight".