609681420 has 36 divisors (see below), whose sum is σ = 1849367520. Its totient is φ = 162581664.

The previous prime is 609681409. The next prime is 609681461. The reversal of 609681420 is 24186906.

609681420 is a `hidden beast` number, since 609 + 6 + 8 + 1 + 42 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×609681420² = 743422867786432800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1693380 + ... + 1693739.

It is an arithmetic number, because the mean of its divisors is an integer number (51371320).

Almost surely, 2^609681420 is an apocalyptic number.

609681420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

609681420 is an abundant number, since it is smaller than the sum of its proper divisors (1239686100).

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

609681420 is a wasteful number, since it uses less digits than its factorization.

609681420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387134 (or 3387129 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 609681420 is about 24691.7277645774. The cubic root of 609681420 is about 847.9449408746.

The spelling of 609681420 in words is "six hundred nine million, six hundred eighty-one thousand, four hundred twenty".