620631240 has 128 divisors (see below), whose sum is σ = 2013672960. Its totient is φ = 152428544.

The previous prime is 620631211. The next prime is 620631269. The reversal of 620631240 is 42136026.

It is an interprime number because it is at equal distance from previous prime (620631211) and next prime (620631269).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 620631240.

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, 92644 + ... + 99116.

It is an arithmetic number, because the mean of its divisors is an integer number (15731820).

Almost surely, 2^620631240 is an apocalyptic number.

620631240 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 620631240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006836480).

620631240 is an abundant number, since it is smaller than the sum of its proper divisors (1393041720).

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

620631240 is a wasteful number, since it uses less digits than its factorization.

620631240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6551 (or 6547 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 620631240 is about 24912.4715754981. The cubic root of 620631240 is about 852.9911870255.

Adding to 620631240 its reverse (42136026), we get a palindrome (662767266).

The spelling of 620631240 in words is "six hundred twenty million, six hundred thirty-one thousand, two hundred forty".