621761667 has 16 divisors (see below), whose sum is σ = 833767968. Its totient is φ = 412139520.

The previous prime is 621761641. The next prime is 621761671. The reversal of 621761667 is 766167126.

It is not a de Polignac number, because 621761667 - 2²⁴ = 604984451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621761617) 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 15 ways as a sum of consecutive naturals, for example, 601383 + ... + 602415.

It is an arithmetic number, because the mean of its divisors is an integer number (52110498).

Almost surely, 2^621761667 is an apocalyptic number.

621761667 is a deficient number, since it is larger than the sum of its proper divisors (212006301).

621761667 is a wasteful number, since it uses less digits than its factorization.

621761667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990.

The product of its digits is 127008, while the sum is 42.

The square root of 621761667 is about 24935.1492275462. The cubic root of 621761667 is about 853.5087565410.

The spelling of 621761667 in words is "six hundred twenty-one million, seven hundred sixty-one thousand, six hundred sixty-seven".