827421408 has 144 divisors (see below), whose sum is σ = 2586729600. Its totient is φ = 248797440.

The previous prime is 827421377. The next prime is 827421449. The reversal of 827421408 is 804124728.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 439413 + ... + 441291.

It is an arithmetic number, because the mean of its divisors is an integer number (17963400).

Almost surely, 2^827421408 is an apocalyptic number.

827421408 is a gapful number since it is divisible by the number (88) 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 827421408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1293364800).

827421408 is an abundant number, since it is smaller than the sum of its proper divisors (1759308192).

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

827421408 is a wasteful number, since it uses less digits than its factorization.

827421408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045 (or 2034 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 827421408 is about 28764.9336519311. The cubic root of 827421408 is about 938.8054117432.

The spelling of 827421408 in words is "eight hundred twenty-seven million, four hundred twenty-one thousand, four hundred eight".