47809890 has 96 divisors (see below), whose sum is σ = 132986880. Its totient is φ = 11881728.

The previous prime is 47809877. The next prime is 47809897. The reversal of 47809890 is 9890874.

47809890 is a `hidden beast` number, since 478 + 0 + 98 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (47809897) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 124639 + ... + 125021.

It is an arithmetic number, because the mean of its divisors is an integer number (1385280).

Almost surely, 2^47809890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47809890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66493440).

47809890 is an abundant number, since it is smaller than the sum of its proper divisors (85176990).

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

47809890 is a wasteful number, since it uses less digits than its factorization.

47809890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 485 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 47809890 is about 6914.4696108957. The cubic root of 47809890 is about 362.9436881890.

The spelling of 47809890 in words is "forty-seven million, eight hundred nine thousand, eight hundred ninety".