620747764 has 48 divisors (see below), whose sum is σ = 1357003648. Its totient is φ = 241895808.

The previous prime is 620747737. The next prime is 620747783. The reversal of 620747764 is 467747026.

It is a self number, because there is not a number n which added to its sum of digits gives 620747764.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11662 + ... + 37114.

Almost surely, 2^620747764 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 620747764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (678501824).

620747764 is an abundant number, since it is smaller than the sum of its proper divisors (736255884).

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

620747764 is a wasteful number, since it uses less digits than its factorization.

620747764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25544 (or 25542 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 43.

The square root of 620747764 is about 24914.8101337337. The cubic root of 620747764 is about 853.0445669387.

The spelling of 620747764 in words is "six hundred twenty million, seven hundred forty-seven thousand, seven hundred sixty-four".