47640440 has 16 divisors (see below), whose sum is σ = 107191080. Its totient is φ = 19056160.

The previous prime is 47640433. The next prime is 47640449. The reversal of 47640440 is 4404674.

It is a super-2 number, since 2×47640440² = 4539223046787200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47640449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 595466 + ... + 595545.

Almost surely, 2^47640440 is an apocalyptic number.

47640440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

47640440 is an abundant number, since it is smaller than the sum of its proper divisors (59550640).

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

47640440 is a wasteful number, since it uses less digits than its factorization.

47640440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191022 (or 1191018 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 47640440 is about 6902.2054446387. The cubic root of 47640440 is about 362.5143934039.

The spelling of 47640440 in words is "forty-seven million, six hundred forty thousand, four hundred forty".