611995920 has 160 divisors (see below), whose sum is σ = 2042547840. Its totient is φ = 151019520.

The previous prime is 611995913. The next prime is 611995949. The reversal of 611995920 is 29599116.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247651 + ... + 250109.

It is an arithmetic number, because the mean of its divisors is an integer number (12765924).

Almost surely, 2^611995920 is an apocalyptic number.

611995920 is a gapful number since it is divisible by the number (60) 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 611995920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021273920).

611995920 is an abundant number, since it is smaller than the sum of its proper divisors (1430551920).

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

611995920 is a wasteful number, since it uses less digits than its factorization.

611995920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2553 (or 2547 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 42.

The square root of 611995920 is about 24738.5512914560. The cubic root of 611995920 is about 849.0165881656.

The spelling of 611995920 in words is "six hundred eleven million, nine hundred ninety-five thousand, nine hundred twenty".