19627649402 has 16 divisors (see below), whose sum is σ = 29718645000. Its totient is φ = 9721477440.

The previous prime is 19627649399. The next prime is 19627649441. The reversal of 19627649402 is 20494672691.

It can be written as a sum of positive squares in 4 ways, for example, as 18189647161 + 1438002241 = 134869^2 + 37921^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1245452 + ... + 1261112.

Almost surely, 2^19627649402 is an apocalyptic number.

19627649402 is a deficient number, since it is larger than the sum of its proper divisors (10090995598).

19627649402 is a wasteful number, since it uses less digits than its factorization.

19627649402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21521.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 19627649402 in words is "nineteen billion, six hundred twenty-seven million, six hundred forty-nine thousand, four hundred two".