1640704534 has 24 divisors (see below), whose sum is σ = 2864271888. Its totient is φ = 702812880.

The previous prime is 1640704523. The next prime is 1640704537. The reversal of 1640704534 is 4354070461.

It is a super-2 number, since 2×1640704534² = 5383822735776314312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1640704534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640704537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 352744 + ... + 357364.

It is an arithmetic number, because the mean of its divisors is an integer number (119344662).

Almost surely, 2^1640704534 is an apocalyptic number.

1640704534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1640704534 is a deficient number, since it is larger than the sum of its proper divisors (1223567354).

1640704534 is a wasteful number, since it uses less digits than its factorization.

1640704534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8260 (or 8253 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 1640704534 is about 40505.6111421615. The cubic root of 1640704534 is about 1179.4425534161.

Adding to 1640704534 its reverse (4354070461), we get a palindrome (5994774995).

The spelling of 1640704534 in words is "one billion, six hundred forty million, seven hundred four thousand, five hundred thirty-four".