620915690 has 8 divisors (see below), whose sum is σ = 1117648260. Its totient is φ = 248366272.

The previous prime is 620915683. The next prime is 620915693. The reversal of 620915690 is 96519026.

It can be written as a sum of positive squares in 2 ways, for example, as 577104529 + 43811161 = 24023^2 + 6619^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×620915690² = 771072588176352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (620915693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31045775 + ... + 31045794.

Almost surely, 2^620915690 is an apocalyptic number.

620915690 is a deficient number, since it is larger than the sum of its proper divisors (496732570).

620915690 is a wasteful number, since it uses less digits than its factorization.

620915690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62091576.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 620915690 is about 24918.1799094557. The cubic root of 620915690 is about 853.1214824778.

The spelling of 620915690 in words is "six hundred twenty million, nine hundred fifteen thousand, six hundred ninety".