6161640 has 32 divisors (see below), whose sum is σ = 18485280. Its totient is φ = 1643072.

The previous prime is 6161629. The next prime is 6161641. The reversal of 6161640 is 461616.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 6161640.

It is not an unprimeable number, because it can be changed into a prime (6161641) 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, 25554 + ... + 25793.

It is an arithmetic number, because the mean of its divisors is an integer number (577665).

Almost surely, 2^6161640 is an apocalyptic number.

6161640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6161640 is an abundant number, since it is smaller than the sum of its proper divisors (12323640).

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

6161640 is a wasteful number, since it uses less digits than its factorization.

6161640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51361 (or 51357 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 6161640 is about 2482.2650946263. The cubic root of 6161640 is about 183.3293956914.

Subtracting from 6161640 its sum of digits (24), we obtain a palindrome (6161616).

The spelling of 6161640 in words is "six million, one hundred sixty-one thousand, six hundred forty".