620428489 has 4 divisors (see below), whose sum is σ = 653082640. Its totient is φ = 587774340.

The previous prime is 620428477. The next prime is 620428493. The reversal of 620428489 is 984824026.

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, and also an emirpimes, since its reverse is a distinct semiprime: 984824026 = 2 ⋅492412013.

It is a cyclic number.

It is not a de Polignac number, because 620428489 - 2¹⁷ = 620297417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620468489) 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, 16327047 + ... + 16327084.

It is an arithmetic number, because the mean of its divisors is an integer number (163270660).

Almost surely, 2^620428489 is an apocalyptic number.

It is an amenable number.

620428489 is a deficient number, since it is larger than the sum of its proper divisors (32654151).

620428489 is a wasteful number, since it uses less digits than its factorization.

620428489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32654150.

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 620428489 is about 24908.4019760401. The cubic root of 620428489 is about 852.8982903953.

The spelling of 620428489 in words is "six hundred twenty million, four hundred twenty-eight thousand, four hundred eighty-nine".