623545453440 has 3072 divisors, whose sum is σ = 3079544832000. Its totient is φ = 112368549888.

The previous prime is 623545453381. The next prime is 623545453471. The reversal of 623545453440 is 44354545326.

623545453440 is a `hidden beast` number, since 6 + 2 + 35 + 4 + 545 + 34 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 4909806657 + ... + 4909806783.

It is an arithmetic number, because the mean of its divisors is an integer number (1002456000).

Almost surely, 2^623545453440 is an apocalyptic number.

623545453440 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 623545453440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1539772416000).

623545453440 is an abundant number, since it is smaller than the sum of its proper divisors (2455999378560).

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

623545453440 is a wasteful number, since it uses less digits than its factorization.

623545453440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 45.

Adding to 623545453440 its reverse (44354545326), we get a palindrome (667899998766).

The spelling of 623545453440 in words is "six hundred twenty-three billion, five hundred forty-five million, four hundred fifty-three thousand, four hundred forty".