19635231428 has 6 divisors (see below), whose sum is σ = 34361655006. Its totient is φ = 9817615712.

The previous prime is 19635231419. The next prime is 19635231433. The reversal of 19635231428 is 82413253691.

It can be written as a sum of positive squares in only one way, i.e., 10446475264 + 9188756164 = 102208^2 + 95858^2 .

It is a super-2 number, since 2×19635231428² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2454403925 + ... + 2454403932.

It is an arithmetic number, because the mean of its divisors is an integer number (5726942501).

Almost surely, 2^19635231428 is an apocalyptic number.

It is an amenable number.

19635231428 is a deficient number, since it is larger than the sum of its proper divisors (14726423578).

19635231428 is a wasteful number, since it uses less digits than its factorization.

19635231428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908807861 (or 4908807859 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The spelling of 19635231428 in words is "nineteen billion, six hundred thirty-five million, two hundred thirty-one thousand, four hundred twenty-eight".