40120664 has 8 divisors (see below), whose sum is σ = 75226260. Its totient is φ = 20060328.

The previous prime is 40120651. The next prime is 40120667. The reversal of 40120664 is 46602104.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40120667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2507534 + ... + 2507549.

Almost surely, 2^40120664 is an apocalyptic number.

It is an amenable number.

40120664 is a deficient number, since it is larger than the sum of its proper divisors (35105596).

40120664 is a wasteful number, since it uses less digits than its factorization.

40120664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5015089 (or 5015085 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 40120664 is about 6334.0874638735. The cubic root of 40120664 is about 342.3387316860.

Adding to 40120664 its reverse (46602104), we get a palindrome (86722768).

The spelling of 40120664 in words is "forty million, one hundred twenty thousand, six hundred sixty-four".