621880705 has 8 divisors (see below), whose sum is σ = 750380904. Its totient is φ = 494755200.

The previous prime is 621880703. The next prime is 621880717. The reversal of 621880705 is 507088126.

It can be written as a sum of positive squares in 4 ways, for example, as 824464 + 621056241 = 908^2 + 24921^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 621880705 - 2¹ = 621880703 is a prime.

It is a super-2 number, since 2×621880705² = 773471222502594050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621880703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342676 + ... + 344485.

It is an arithmetic number, because the mean of its divisors is an integer number (93797613).

Almost surely, 2^621880705 is an apocalyptic number.

It is an amenable number.

621880705 is a deficient number, since it is larger than the sum of its proper divisors (128500199).

621880705 is a wasteful number, since it uses less digits than its factorization.

621880705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687347.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 621880705 is about 24937.5360651368. The cubic root of 621880705 is about 853.5632219402.

The spelling of 621880705 in words is "six hundred twenty-one million, eight hundred eighty thousand, seven hundred five".