618311772 has 48 divisors (see below), whose sum is σ = 1726344480. Its totient is φ = 190249344.

The previous prime is 618311767. The next prime is 618311779. The reversal of 618311772 is 277113816.

618311772 is a `hidden beast` number, since 618 + 31 + 1 + 7 + 7 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618311779) 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, 218793 + ... + 221600.

It is an arithmetic number, because the mean of its divisors is an integer number (35965510).

Almost surely, 2^618311772 is an apocalyptic number.

It is an amenable number.

618311772 is an abundant number, since it is smaller than the sum of its proper divisors (1108032708).

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

618311772 is a wasteful number, since it uses less digits than its factorization.

618311772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440419 (or 440411 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 618311772 is about 24865.8756531919. The cubic root of 618311772 is about 851.9272403647.

It can be divided in two parts, 6183 and 11772, that added together give a triangular number (17955 = T₁₈₉).

The spelling of 618311772 in words is "six hundred eighteen million, three hundred eleven thousand, seven hundred seventy-two".