621438480 has 240 divisors, whose sum is σ = 2331725760. Its totient is φ = 152907264.

The previous prime is 621438473. The next prime is 621438481. The reversal of 621438480 is 84834126.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (621438481) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 251491 + ... + 253949.

It is an arithmetic number, because the mean of its divisors is an integer number (9715524).

Almost surely, 2^621438480 is an apocalyptic number.

621438480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621438480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1165862880).

621438480 is an abundant number, since it is smaller than the sum of its proper divisors (1710287280).

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

621438480 is a wasteful number, since it uses less digits than its factorization.

621438480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500 (or 2482 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 621438480 is about 24928.6678344431. The cubic root of 621438480 is about 853.3608484509.

The spelling of 621438480 in words is "six hundred twenty-one million, four hundred thirty-eight thousand, four hundred eighty".