620139786 has 96 divisors (see below), whose sum is σ = 1482583680. Its totient is φ = 172368000.

The previous prime is 620139757. The next prime is 620139791. The reversal of 620139786 is 687931026.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2707920 + ... + 2708148.

It is an arithmetic number, because the mean of its divisors is an integer number (15443580).

Almost surely, 2^620139786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620139786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741291840).

620139786 is an abundant number, since it is smaller than the sum of its proper divisors (862443894).

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

620139786 is a wasteful number, since it uses less digits than its factorization.

620139786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 620139786 is about 24902.6060082073. The cubic root of 620139786 is about 852.7659772694.

The spelling of 620139786 in words is "six hundred twenty million, one hundred thirty-nine thousand, seven hundred eighty-six".