40640064 has 56 divisors (see below), whose sum is σ = 113861088. Its totient is φ = 12748800.

The previous prime is 40640053. The next prime is 40640113. The reversal of 40640064 is 46004604.

It is a super-2 number, since 2×40640064² = 3303229603848192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 2962 + ... + 9489.

Almost surely, 2^40640064 is an apocalyptic number.

It is an amenable number.

40640064 is an abundant number, since it is smaller than the sum of its proper divisors (73221024).

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

40640064 is a wasteful number, since it uses less digits than its factorization.

40640064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12483 (or 12473 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 40640064 is about 6374.9559998482. The cubic root of 40640064 is about 343.8097018509.

Adding to 40640064 its reverse (46004604), we get a palindrome (86644668).

It can be divided in two parts, 406 and 40064, that added together give a triangular number (40470 = T₂₈₄).

The spelling of 40640064 in words is "forty million, six hundred forty thousand, sixty-four".