621404005 has 8 divisors (see below), whose sum is σ = 748039032. Its totient is φ = 495553728.

The previous prime is 621403973. The next prime is 621404023. The reversal of 621404005 is 500404126.

It can be written as a sum of positive squares in 4 ways, for example, as 6066369 + 615337636 = 2463^2 + 24806^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 621404005 - 2⁵ = 621403973 is a prime.

It is a super-2 number, since 2×621404005² = 772285874860080050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194442 + ... + 197611.

It is an arithmetic number, because the mean of its divisors is an integer number (93504879).

Almost surely, 2^621404005 is an apocalyptic number.

It is an amenable number.

621404005 is a deficient number, since it is larger than the sum of its proper divisors (126635027).

621404005 is a wasteful number, since it uses less digits than its factorization.

621404005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392375.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 621404005 is about 24927.9763518822. The cubic root of 621404005 is about 853.3450677742.

The spelling of 621404005 in words is "six hundred twenty-one million, four hundred four thousand, five".