47021688 has 128 divisors (see below), whose sum is σ = 151027200. Its totient is φ = 13277952.

The previous prime is 47021687. The next prime is 47021693. The reversal of 47021688 is 88612074.

It is a super-2 number, since 2×47021688² = 4422078284738688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47021687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207031 + ... + 207257.

It is an arithmetic number, because the mean of its divisors is an integer number (1179900).

Almost surely, 2^47021688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47021688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75513600).

47021688 is an abundant number, since it is smaller than the sum of its proper divisors (104005512).

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

47021688 is a wasteful number, since it uses less digits than its factorization.

47021688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 376 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 47021688 is about 6857.2361779364. The cubic root of 47021688 is about 360.9381088538.

The spelling of 47021688 in words is "forty-seven million, twenty-one thousand, six hundred eighty-eight".