64031540 has 24 divisors (see below), whose sum is σ = 140313600. Its totient is φ = 24498848.

The previous prime is 64031533. The next prime is 64031557. The reversal of 64031540 is 4513046.

64031540 = T₃₇ + T₃₈ + ... + T₇₂₆.

It is a happy number.

64031540 is nontrivially palindromic in base 15.

It is a super-2 number, since 2×64031540² = 8200076229543200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 69140 + ... + 70059.

It is an arithmetic number, because the mean of its divisors is an integer number (5846400).

Almost surely, 2^64031540 is an apocalyptic number.

It is an amenable number.

64031540 is an abundant number, since it is smaller than the sum of its proper divisors (76282060).

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

64031540 is a wasteful number, since it uses less digits than its factorization.

64031540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139231 (or 139229 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 64031540 is about 8001.9710071957. The cubic root of 64031540 is about 400.0656975423.

Adding to 64031540 its reverse (4513046), we get a palindrome (68544586).

The spelling of 64031540 in words is "sixty-four million, thirty-one thousand, five hundred forty".