609191260440 has 64 divisors (see below), whose sum is σ = 2088655752960. Its totient is φ = 139243716480.

The previous prime is 609191260421. The next prime is 609191260441. The reversal of 609191260440 is 44062191906.

It is a super-2 number, since 2×609191260440² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 609191260392 and 609191260401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609191260441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 362613006 + ... + 362614685.

It is an arithmetic number, because the mean of its divisors is an integer number (32635246140).

Almost surely, 2^609191260440 is an apocalyptic number.

609191260440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

609191260440 is an abundant number, since it is smaller than the sum of its proper divisors (1479464492520).

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

609191260440 is a wasteful number, since it uses less digits than its factorization.

609191260440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725227712 (or 725227708 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The spelling of 609191260440 in words is "six hundred nine billion, one hundred ninety-one million, two hundred sixty thousand, four hundred forty".