657045040 has 20 divisors (see below), whose sum is σ = 1527629904. Its totient is φ = 262817984.

The previous prime is 657044987. The next prime is 657045043. The reversal of 657045040 is 40540756.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-4 number, since 4×657045040⁴ (a number of 36 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 657044993 and 657045011.

It is not an unprimeable number, because it can be changed into a prime (657045043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4106452 + ... + 4106611.

Almost surely, 2^657045040 is an apocalyptic number.

It is an amenable number.

657045040 is an abundant number, since it is smaller than the sum of its proper divisors (870584864).

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

657045040 is a wasteful number, since it uses less digits than its factorization.

657045040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8213076 (or 8213070 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 657045040 is about 25632.8898097737. The cubic root of 657045040 is about 869.3574504226.

Adding to 657045040 its reverse (40540756), we get a palindrome (697585796).

The spelling of 657045040 in words is "six hundred fifty-seven million, forty-five thousand, forty".