667616620 has 96 divisors (see below), whose sum is σ = 1609445376. Its totient is φ = 230380800.

The previous prime is 667616617. The next prime is 667616633. The reversal of 667616620 is 26616766.

667616620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 360537 + ... + 362383.

It is an arithmetic number, because the mean of its divisors is an integer number (16765056).

Almost surely, 2^667616620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667616620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804722688).

667616620 is an abundant number, since it is smaller than the sum of its proper divisors (941828756).

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

667616620 is a wasteful number, since it uses less digits than its factorization.

667616620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1951 (or 1949 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 667616620 is about 25838.2781934091. The cubic root of 667616620 is about 873.9951981471.

It can be divided in two parts, 667 and 616620, that multiplied together give a triangular number (411285540 = T₂₈₆₈₀).

The spelling of 667616620 in words is "six hundred sixty-seven million, six hundred sixteen thousand, six hundred twenty".