475991640 has 160 divisors (see below), whose sum is σ = 1615988880. Its totient is φ = 125653248.

The previous prime is 475991617. The next prime is 475991729. The reversal of 475991640 is 46199574.

475991640 is a `hidden beast` number, since 4 + 7 + 599 + 16 + 40 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 345994 + ... + 347366.

Almost surely, 2^475991640 is an apocalyptic number.

475991640 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 475991640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (807994440).

475991640 is an abundant number, since it is smaller than the sum of its proper divisors (1139997240).

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

475991640 is a wasteful number, since it uses less digits than its factorization.

475991640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503 (or 1490 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 475991640 is about 21817.2326384443. The cubic root of 475991640 is about 780.7879611249.

The spelling of 475991640 in words is "four hundred seventy-five million, nine hundred ninety-one thousand, six hundred forty".