1642950728 has 8 divisors (see below), whose sum is σ = 3080532630. Its totient is φ = 821475360.

The previous prime is 1642950713. The next prime is 1642950773. The reversal of 1642950728 is 8270592461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 867773764 + 775176964 = 29458^2 + 27842^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102684413 + ... + 102684428.

Almost surely, 2^1642950728 is an apocalyptic number.

It is an amenable number.

1642950728 is a deficient number, since it is larger than the sum of its proper divisors (1437581902).

1642950728 is a wasteful number, since it uses less digits than its factorization.

1642950728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205368847 (or 205368843 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 1642950728 is about 40533.3286074559. The cubic root of 1642950728 is about 1179.9805435842.

The spelling of 1642950728 in words is "one billion, six hundred forty-two million, nine hundred fifty thousand, seven hundred twenty-eight".