1642128079 has 8 divisors (see below), whose sum is σ = 1720046592. Its totient is φ = 1564753080.

The previous prime is 1642128011. The next prime is 1642128083. The reversal of 1642128079 is 9708212461.

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

It is a cyclic number.

It is not a de Polignac number, because 1642128079 - 2²¹ = 1640030927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642123079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129687 + ... + 141784.

It is an arithmetic number, because the mean of its divisors is an integer number (215005824).

Almost surely, 2^1642128079 is an apocalyptic number.

1642128079 is a deficient number, since it is larger than the sum of its proper divisors (77918513).

1642128079 is a wasteful number, since it uses less digits than its factorization.

1642128079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271757.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1642128079 is about 40523.1795272780. The cubic root of 1642128079 is about 1179.7835663085.

The spelling of 1642128079 in words is "one billion, six hundred forty-two million, one hundred twenty-eight thousand, seventy-nine".