621389478 has 8 divisors (see below), whose sum is σ = 1242778968. Its totient is φ = 207129824.

The previous prime is 621389429. The next prime is 621389479. The reversal of 621389478 is 874983126.

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

621389478 is an admirable number.

It is a super-2 number, since 2×621389478² = 772249766738224968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621389479) 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 3 ways as a sum of consecutive naturals, for example, 51782451 + ... + 51782462.

It is an arithmetic number, because the mean of its divisors is an integer number (155347371).

Almost surely, 2^621389478 is an apocalyptic number.

621389478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621389478 is a wasteful number, since it uses less digits than its factorization.

621389478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103564918.

The product of its digits is 580608, while the sum is 48.

The square root of 621389478 is about 24927.6849707308. The cubic root of 621389478 is about 853.3384179724.

The spelling of 621389478 in words is "six hundred twenty-one million, three hundred eighty-nine thousand, four hundred seventy-eight".