1642744720 has 80 divisors (see below), whose sum is σ = 3862127808. Its totient is φ = 649797120.

The previous prime is 1642744687. The next prime is 1642744757. The reversal of 1642744720 is 274472461.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1642744720² = 5397220430175756800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1642744720.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5182002 + ... + 5182318.

Almost surely, 2^1642744720 is an apocalyptic number.

1642744720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642744720 is an abundant number, since it is smaller than the sum of its proper divisors (2219383088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1642744720 is a wasteful number, since it uses less digits than its factorization.

1642744720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 37.

The square root of 1642744720 is about 40530.7873103891. The cubic root of 1642744720 is about 1179.9312226503.

The spelling of 1642744720 in words is "one billion, six hundred forty-two million, seven hundred forty-four thousand, seven hundred twenty".