1642720102 has 4 divisors (see below), whose sum is σ = 2464080156. Its totient is φ = 821360050.

The previous prime is 1642720097. The next prime is 1642720111. The reversal of 1642720102 is 2010272461.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410680024 + ... + 410680027.

It is an arithmetic number, because the mean of its divisors is an integer number (616020039).

Almost surely, 2^1642720102 is an apocalyptic number.

1642720102 is a deficient number, since it is larger than the sum of its proper divisors (821360054).

1642720102 is an equidigital number, since it uses as much as digits as its factorization.

1642720102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821360053.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1642720102 is about 40530.4836141885. The cubic root of 1642720102 is about 1179.9253285124.

Adding to 1642720102 its reverse (2010272461), we get a palindrome (3652992563).

The spelling of 1642720102 in words is "one billion, six hundred forty-two million, seven hundred twenty thousand, one hundred two".