621323136 has 240 divisors, whose sum is σ = 2152691640. Its totient is φ = 177375744.

The previous prime is 621323119. The next prime is 621323137. The reversal of 621323136 is 631323126.

It is a happy number.

621323136 is a `hidden beast` number, since 621 + 3 + 2 + 3 + 1 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621323137) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 507421 + ... + 508643.

Almost surely, 2^621323136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621323136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1076345820).

621323136 is an abundant number, since it is smaller than the sum of its proper divisors (1531368504).

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

621323136 is a wasteful number, since it uses less digits than its factorization.

621323136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263 (or 1235 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 621323136 is about 24926.3542460585. The cubic root of 621323136 is about 853.3080482959.

The spelling of 621323136 in words is "six hundred twenty-one million, three hundred twenty-three thousand, one hundred thirty-six".