51708090 has 64 divisors (see below), whose sum is σ = 143813376. Its totient is φ = 11653632.

The previous prime is 51708077. The next prime is 51708091. The reversal of 51708090 is 9080715.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (51708091) 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, 13644 + ... + 17016.

It is an arithmetic number, because the mean of its divisors is an integer number (2247084).

Almost surely, 2^51708090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51708090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71906688).

51708090 is an abundant number, since it is smaller than the sum of its proper divisors (92105286).

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

51708090 is a wasteful number, since it uses less digits than its factorization.

51708090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3463.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 51708090 is about 7190.8337485997. The cubic root of 51708090 is about 372.5513704809.

The spelling of 51708090 in words is "fifty-one million, seven hundred eight thousand, ninety".