1028735638 has 8 divisors (see below), whose sum is σ = 1763546832. Its totient is φ = 440886696.

The previous prime is 1028735597. The next prime is 1028735657. The reversal of 1028735638 is 8365378201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1028735594 and 1028735603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36740545 + ... + 36740572.

It is an arithmetic number, because the mean of its divisors is an integer number (220443354).

Almost surely, 2^1028735638 is an apocalyptic number.

1028735638 is a deficient number, since it is larger than the sum of its proper divisors (734811194).

1028735638 is an equidigital number, since it uses as much as digits as its factorization.

1028735638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73481126.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 1028735638 is about 32073.9089915776. The cubic root of 1028735638 is about 1009.4882346717.

The spelling of 1028735638 in words is "one billion, twenty-eight million, seven hundred thirty-five thousand, six hundred thirty-eight".