47706440 has 32 divisors (see below), whose sum is σ = 107569080. Its totient is φ = 19041792.

The previous prime is 47706409. The next prime is 47706497. The reversal of 47706440 is 4460774.

It can be written as a sum of positive squares in 4 ways, for example, as 28922884 + 18783556 = 5378^2 + 4334^2 .

It is a junction number, because it is equal to n+sod(n) for n = 47706397 and 47706406.

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, 23714 + ... + 25646.

Almost surely, 2^47706440 is an apocalyptic number.

47706440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

47706440 is an abundant number, since it is smaller than the sum of its proper divisors (59862640).

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

47706440 is a wasteful number, since it uses less digits than its factorization.

47706440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561 (or 2557 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 32.

The square root of 47706440 is about 6906.9848704047. The cubic root of 47706440 is about 362.6817226004.

The spelling of 47706440 in words is "forty-seven million, seven hundred six thousand, four hundred forty".