64473840 has 160 divisors (see below), whose sum is σ = 233913600. Its totient is φ = 16277760.

The previous prime is 64473797. The next prime is 64473883. The reversal of 64473840 is 4837446.

64473840 is a `hidden beast` number, since 644 + 7 + 3 + 8 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (64473797) and next prime (64473883).

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 = 64473795 and 64473804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40255 + ... + 41825.

It is an arithmetic number, because the mean of its divisors is an integer number (1461960).

Almost surely, 2^64473840 is an apocalyptic number.

64473840 is a gapful number since it is divisible by the number (60) 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 64473840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116956800).

64473840 is an abundant number, since it is smaller than the sum of its proper divisors (169439760).

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

64473840 is a wasteful number, since it uses less digits than its factorization.

64473840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612 (or 1600 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 64473840 is about 8029.5603864720. The cubic root of 64473840 is about 400.9847403932.

The spelling of 64473840 in words is "sixty-four million, four hundred seventy-three thousand, eight hundred forty".