999032077638 has 48 divisors (see below), whose sum is σ = 2484058495776. Its totient is φ = 284253338880.

The previous prime is 999032077619. The next prime is 999032077639. The reversal of 999032077638 is 836770230999.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999032077639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16419481 + ... + 16480212.

It is an arithmetic number, because the mean of its divisors is an integer number (51751218662).

Almost surely, 2^999032077638 is an apocalyptic number.

999032077638 is an abundant number, since it is smaller than the sum of its proper divisors (1485026418138).

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

999032077638 is a wasteful number, since it uses less digits than its factorization.

999032077638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32899949 (or 32899946 counting only the distinct ones).

The product of its (nonzero) digits is 30862944, while the sum is 63.

The spelling of 999032077638 in words is "nine hundred ninety-nine billion, thirty-two million, seventy-seven thousand, six hundred thirty-eight".