621247977 has 12 divisors (see below), whose sum is σ = 1025552320. Its totient is φ = 354998808.

The previous prime is 621247969. The next prime is 621247987. The reversal of 621247977 is 779742126.

It is not a de Polignac number, because 621247977 - 2³ = 621247969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621247987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4930477 + ... + 4930602.

Almost surely, 2^621247977 is an apocalyptic number.

It is an amenable number.

621247977 is a deficient number, since it is larger than the sum of its proper divisors (404304343).

621247977 is a wasteful number, since it uses less digits than its factorization.

621247977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9861092 (or 9861089 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 621247977 is about 24924.8465792670. The cubic root of 621247977 is about 853.2736398097.

The spelling of 621247977 in words is "six hundred twenty-one million, two hundred forty-seven thousand, nine hundred seventy-seven".