621678355 has 8 divisors (see below), whose sum is σ = 789897312. Its totient is φ = 468087168.

The previous prime is 621678341. The next prime is 621678359. The reversal of 621678355 is 553876126.

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 621678355 - 2²⁷ = 487460627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621678359) 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, 3656847 + ... + 3657016.

It is an arithmetic number, because the mean of its divisors is an integer number (98737164).

Almost surely, 2^621678355 is an apocalyptic number.

621678355 is a deficient number, since it is larger than the sum of its proper divisors (168218957).

621678355 is a wasteful number, since it uses less digits than its factorization.

621678355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7313885.

The product of its digits is 302400, while the sum is 43.

The square root of 621678355 is about 24933.4785980617. The cubic root of 621678355 is about 853.4706333064.

It can be divided in two parts, 621 and 678355, that added together give a square (678976 = 824²).

The spelling of 621678355 in words is "six hundred twenty-one million, six hundred seventy-eight thousand, three hundred fifty-five".