990477408 has 48 divisors (see below), whose sum is σ = 2611220976. Its totient is φ = 328734720.

The previous prime is 990477377. The next prime is 990477421. The reversal of 990477408 is 804774099.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228 + ... + 44508.

It is an arithmetic number, because the mean of its divisors is an integer number (54400437).

Almost surely, 2^990477408 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 990477408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1305610488).

990477408 is an abundant number, since it is smaller than the sum of its proper divisors (1620743568).

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

990477408 is a wasteful number, since it uses less digits than its factorization.

990477408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44527 (or 44519 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 990477408 is about 31471.8510418437. The cubic root of 990477408 is about 996.8156734943.

The spelling of 990477408 in words is "nine hundred ninety million, four hundred seventy-seven thousand, four hundred eight".