66457040 has 40 divisors (see below), whose sum is σ = 166400808. Its totient is φ = 24537600.

The previous prime is 66457033. The next prime is 66457049. The reversal of 66457040 is 4075466.

It can be written as a sum of positive squares in 4 ways, for example, as 10086976 + 56370064 = 3176^2 + 7508^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 66456988 and 66457006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66457049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30911 + ... + 32990.

Almost surely, 2^66457040 is an apocalyptic number.

It is an amenable number.

66457040 is an abundant number, since it is smaller than the sum of its proper divisors (99943768).

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

66457040 is a wasteful number, since it uses less digits than its factorization.

66457040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63927 (or 63921 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 66457040 is about 8152.1187430017. The cubic root of 66457040 is about 405.0546895612.

The spelling of 66457040 in words is "sixty-six million, four hundred fifty-seven thousand, forty".