620694989 has 16 divisors (see below), whose sum is σ = 650741760. Its totient is φ = 591338880.

The previous prime is 620694979. The next prime is 620695001. The reversal of 620694989 is 989496026.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620694989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 620694989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620694959) 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, 1012247 + ... + 1012859.

It is an arithmetic number, because the mean of its divisors is an integer number (40671360).

Almost surely, 2^620694989 is an apocalyptic number.

It is an amenable number.

620694989 is a deficient number, since it is larger than the sum of its proper divisors (30046771).

620694989 is a wasteful number, since it uses less digits than its factorization.

620694989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The square root of 620694989 is about 24913.7510022076. The cubic root of 620694989 is about 853.0203914172.

The spelling of 620694989 in words is "six hundred twenty million, six hundred ninety-four thousand, nine hundred eighty-nine".