620644513 has 4 divisors (see below), whose sum is σ = 621410608. Its totient is φ = 619878420.

The previous prime is 620644487. The next prime is 620644523. The reversal of 620644513 is 315446026.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 620644513 - 2¹³ = 620636321 is a prime.

It is a super-2 number, since 2×620644513² = 770399223034014338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620644523) 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, 381831 + ... + 383452.

It is an arithmetic number, because the mean of its divisors is an integer number (155352652).

Almost surely, 2^620644513 is an apocalyptic number.

It is an amenable number.

620644513 is a deficient number, since it is larger than the sum of its proper divisors (766095).

620644513 is an equidigital number, since it uses as much as digits as its factorization.

620644513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766094.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 620644513 is about 24912.7379667511. The cubic root of 620644513 is about 852.9972677546.

The spelling of 620644513 in words is "six hundred twenty million, six hundred forty-four thousand, five hundred thirteen".