64473240 has 128 divisors (see below), whose sum is σ = 214119360. Its totient is φ = 15427584.

The previous prime is 64473239. The next prime is 64473247. The reversal of 64473240 is 4237446.

64473240 = 450² + 451² + ... + 657².

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64473198 and 64473207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64473247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57162 + ... + 58278.

Almost surely, 2^64473240 is an apocalyptic number.

64473240 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 64473240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107059680).

64473240 is an abundant number, since it is smaller than the sum of its proper divisors (149646120).

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

64473240 is a wasteful number, since it uses less digits than its factorization.

64473240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181 (or 1177 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 30.

The square root of 64473240 is about 8029.5230244392. The cubic root of 64473240 is about 400.9834965213.

The spelling of 64473240 in words is "sixty-four million, four hundred seventy-three thousand, two hundred forty".