405578880 has 384 divisors, whose sum is σ = 1674432000. Its totient is φ = 92510208.

The previous prime is 405578879. The next prime is 405578897. The reversal of 405578880 is 88875504.

It is a tau number, because it is divible by the number of its divisors (384).

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 846481 + ... + 846959.

It is an arithmetic number, because the mean of its divisors is an integer number (4360500).

Almost surely, 2^405578880 is an apocalyptic number.

405578880 is a gapful number since it is divisible by the number (40) 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 405578880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (837216000).

405578880 is an abundant number, since it is smaller than the sum of its proper divisors (1268853120).

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

405578880 is a wasteful number, since it uses less digits than its factorization.

405578880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The square root of 405578880 is about 20138.9890510919. The cubic root of 405578880 is about 740.2159583963.

The spelling of 405578880 in words is "four hundred five million, five hundred seventy-eight thousand, eight hundred eighty".