621945487 has 4 divisors (see below), whose sum is σ = 654679480. Its totient is φ = 589211496.

The previous prime is 621945479. The next prime is 621945517. The reversal of 621945487 is 784549126.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621945487 - 2³ = 621945479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621945437) 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, 16366968 + ... + 16367005.

It is an arithmetic number, because the mean of its divisors is an integer number (163669870).

Almost surely, 2^621945487 is an apocalyptic number.

621945487 is a deficient number, since it is larger than the sum of its proper divisors (32733993).

621945487 is a wasteful number, since it uses less digits than its factorization.

621945487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32733992.

The product of its digits is 483840, while the sum is 46.

The square root of 621945487 is about 24938.8349166516. The cubic root of 621945487 is about 853.5928597856.

The spelling of 621945487 in words is "six hundred twenty-one million, nine hundred forty-five thousand, four hundred eighty-seven".