620688815 has 16 divisors (see below), whose sum is σ = 768089088. Its totient is φ = 481249056.

The previous prime is 620688811. The next prime is 620688823. The reversal of 620688815 is 518886026.

It is a cyclic number.

It is not a de Polignac number, because 620688815 - 2² = 620688811 is a prime.

It is a super-2 number, since 2×620688815² = 770509210132208450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620688811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11384 + ... + 37026.

It is an arithmetic number, because the mean of its divisors is an integer number (48005568).

Almost surely, 2^620688815 is an apocalyptic number.

620688815 is a deficient number, since it is larger than the sum of its proper divisors (147400273).

620688815 is a wasteful number, since it uses less digits than its factorization.

620688815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25798.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 620688815 is about 24913.6270944236. The cubic root of 620688815 is about 853.0175631008.

The spelling of 620688815 in words is "six hundred twenty million, six hundred eighty-eight thousand, eight hundred fifteen".