923471640 has 288 divisors, whose sum is σ = 3760782480. Its totient is φ = 194793984.

The previous prime is 923471623. The next prime is 923471663. The reversal of 923471640 is 46174329.

923471640 is a `hidden beast` number, since 9 + 2 + 3 + 4 + 7 + 1 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 923471595 and 923471604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 227307 + ... + 231333.

Almost surely, 2^923471640 is an apocalyptic number.

923471640 is a gapful number since it is divisible by the number (90) 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 923471640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1880391240).

923471640 is an abundant number, since it is smaller than the sum of its proper divisors (2837310840).

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

923471640 is a wasteful number, since it uses less digits than its factorization.

923471640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071 (or 4057 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 923471640 is about 30388.6761804459. The cubic root of 923471640 is about 973.8106523357.

The spelling of 923471640 in words is "nine hundred twenty-three million, four hundred seventy-one thousand, six hundred forty".