620520737 has 4 divisors (see below), whose sum is σ = 626917956. Its totient is φ = 614123520.

The previous prime is 620520721. The next prime is 620520739. The reversal of 620520737 is 737025026.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 737025026 = 2 ⋅368512513.

It can be written as a sum of positive squares in 2 ways, for example, as 168065296 + 452455441 = 12964^2 + 21271^2 .

It is a cyclic number.

It is not a de Polignac number, because 620520737 - 2⁴ = 620520721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620520739) 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, 3198464 + ... + 3198657.

It is an arithmetic number, because the mean of its divisors is an integer number (156729489).

Almost surely, 2^620520737 is an apocalyptic number.

It is an amenable number.

620520737 is a deficient number, since it is larger than the sum of its proper divisors (6397219).

620520737 is an equidigital number, since it uses as much as digits as its factorization.

620520737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6397218.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 620520737 is about 24910.2536518599. The cubic root of 620520737 is about 852.9405591734.

The spelling of 620520737 in words is "six hundred twenty million, five hundred twenty thousand, seven hundred thirty-seven".