620066640 has 40 divisors (see below), whose sum is σ = 1922207328. Its totient is φ = 165351040.

The previous prime is 620066639. The next prime is 620066641. The reversal of 620066640 is 46660026.

It is an interprime number because it is at equal distance from previous prime (620066639) and next prime (620066641).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 620066598 and 620066607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620066641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1291566 + ... + 1292045.

Almost surely, 2^620066640 is an apocalyptic number.

620066640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

620066640 is an abundant number, since it is smaller than the sum of its proper divisors (1302140688).

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

620066640 is a wasteful number, since it uses less digits than its factorization.

620066640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583627 (or 2583621 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 620066640 is about 24901.1373234236. The cubic root of 620066640 is about 852.7324478006.

The spelling of 620066640 in words is "six hundred twenty million, sixty-six thousand, six hundred forty".