620660864 has 16 divisors (see below), whose sum is σ = 1236473070. Its totient is φ = 310330368.

The previous prime is 620660809. The next prime is 620660867. The reversal of 620660864 is 468066026.

It can be written as a sum of positive squares in only one way, i.e., 601230400 + 19430464 = 24520^2 + 4408^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (620660867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2424329 + ... + 2424584.

Almost surely, 2^620660864 is an apocalyptic number.

620660864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

620660864 is a deficient number, since it is larger than the sum of its proper divisors (615812206).

620660864 is an equidigital number, since it uses as much as digits as its factorization.

620660864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4848927 (or 4848915 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 620660864 is about 24913.0661300451. The cubic root of 620660864 is about 853.0047584816.

The spelling of 620660864 in words is "six hundred twenty million, six hundred sixty thousand, eight hundred sixty-four".