64542040 has 32 divisors (see below), whose sum is σ = 145741680. Its totient is φ = 25724032.

The previous prime is 64542029. The next prime is 64542059. The reversal of 64542040 is 4024546.

It is a junction number, because it is equal to n+sod(n) for n = 64541996 and 64542014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8967 + ... + 14473.

Almost surely, 2^64542040 is an apocalyptic number.

It is an amenable number.

64542040 is an abundant number, since it is smaller than the sum of its proper divisors (81199640).

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

64542040 is a wasteful number, since it uses less digits than its factorization.

64542040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5811 (or 5807 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 64542040 is about 8033.8060718442. The cubic root of 64542040 is about 401.1260769022.

Adding to 64542040 its reverse (4024546), we get a palindrome (68566586).

The spelling of 64542040 in words is "sixty-four million, five hundred forty-two thousand, forty".