1642897700 has 72 divisors (see below), whose sum is σ = 3873918720. Its totient is φ = 602467200.

The previous prime is 1642897699. The next prime is 1642897703. The reversal of 1642897700 is 77982461.

It is a super-2 number, since 2×1642897700² = 5398225705330580000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1642897703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44954 + ... + 72846.

Almost surely, 2^1642897700 is an apocalyptic number.

1642897700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1642897700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1936959360).

1642897700 is an abundant number, since it is smaller than the sum of its proper divisors (2231021020).

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

1642897700 is a wasteful number, since it uses less digits than its factorization.

1642897700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27957 (or 27950 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 1642897700 is about 40532.6744738119. The cubic root of 1642897700 is about 1179.9678484010.

The spelling of 1642897700 in words is "one billion, six hundred forty-two million, eight hundred ninety-seven thousand, seven hundred".