621778001 has 8 divisors (see below), whose sum is σ = 669971904. Its totient is φ = 573636240.

The previous prime is 621777913. The next prime is 621778057. The reversal of 621778001 is 100877126.

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 621778001 - 2¹⁴ = 621761617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621778061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13796 + ... + 37866.

It is an arithmetic number, because the mean of its divisors is an integer number (83746488).

Almost surely, 2^621778001 is an apocalyptic number.

It is an amenable number.

621778001 is a deficient number, since it is larger than the sum of its proper divisors (48193903).

621778001 is a wasteful number, since it uses less digits than its factorization.

621778001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26071.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 621778001 is about 24935.4767550171. The cubic root of 621778001 is about 853.5162305141.

The spelling of 621778001 in words is "six hundred twenty-one million, seven hundred seventy-eight thousand, one".