620618840 has 16 divisors (see below), whose sum is σ = 1396392480. Its totient is φ = 248247520.

The previous prime is 620618833. The next prime is 620618861. The reversal of 620618840 is 48816026.

It is a self number, because there is not a number n which added to its sum of digits gives 620618840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7757696 + ... + 7757775.

It is an arithmetic number, because the mean of its divisors is an integer number (87274530).

Almost surely, 2^620618840 is an apocalyptic number.

It is an amenable number.

620618840 is an abundant number, since it is smaller than the sum of its proper divisors (775773640).

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

620618840 is a wasteful number, since it uses less digits than its factorization.

620618840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15515482 (or 15515478 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 620618840 is about 24912.2227029224. Note that the first 3 decimals coincide. The cubic root of 620618840 is about 852.9855061635.

The spelling of 620618840 in words is "six hundred twenty million, six hundred eighteen thousand, eight hundred forty".