611012720 has 20 divisors (see below), whose sum is σ = 1420604760. Its totient is φ = 244405056.

The previous prime is 611012707. The next prime is 611012729. The reversal of 611012720 is 27210116.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 611012692 and 611012701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611012729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3818750 + ... + 3818909.

It is an arithmetic number, because the mean of its divisors is an integer number (71030238).

Almost surely, 2^611012720 is an apocalyptic number.

It is an amenable number.

611012720 is an abundant number, since it is smaller than the sum of its proper divisors (809592040).

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

611012720 is a wasteful number, since it uses less digits than its factorization.

611012720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7637672 (or 7637666 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 611012720 is about 24718.6714853367. The cubic root of 611012720 is about 848.5616828823.

Adding to 611012720 its reverse (27210116), we get a palindrome (638222836).

The spelling of 611012720 in words is "six hundred eleven million, twelve thousand, seven hundred twenty".