620445888 has 84 divisors (see below), whose sum is σ = 1808637480. Its totient is φ = 203298816.

The previous prime is 620445887. The next prime is 620445899. The reversal of 620445888 is 888544026.

620445888 is a `hidden beast` number, since 6 + 20 + 44 + 588 + 8 = 666.

It is a super-2 number, since 2×620445888² = 769906199872217088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620445887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24856 + ... + 43112.

Almost surely, 2^620445888 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 620445888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904318740).

620445888 is an abundant number, since it is smaller than the sum of its proper divisors (1188191592).

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

620445888 is a wasteful number, since it uses less digits than its factorization.

620445888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18334 (or 18321 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 45.

The square root of 620445888 is about 24908.7512332513. The cubic root of 620445888 is about 852.9062630781.

The spelling of 620445888 in words is "six hundred twenty million, four hundred forty-five thousand, eight hundred eighty-eight".