620987640 has 512 divisors, whose sum is σ = 2506291200. Its totient is φ = 119439360.

The previous prime is 620987617. The next prime is 620987677. The reversal of 620987640 is 46789026.

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

It is a junction number, because it is equal to n+sod(n) for n = 620987592 and 620987601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8506644 + ... + 8506716.

It is an arithmetic number, because the mean of its divisors is an integer number (4895100).

Almost surely, 2^620987640 is an apocalyptic number.

620987640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620987640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1253145600).

620987640 is an abundant number, since it is smaller than the sum of its proper divisors (1885303560).

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

620987640 is a wasteful number, since it uses less digits than its factorization.

620987640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 620987640 is about 24919.6235926629. The cubic root of 620987640 is about 853.1544336609.

The spelling of 620987640 in words is "six hundred twenty million, nine hundred eighty-seven thousand, six hundred forty".