51085650 has 96 divisors (see below), whose sum is σ = 157989888. Its totient is φ = 10612800.

The previous prime is 51085649. The next prime is 51085651. The reversal of 51085650 is 5658015.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51085649) and next prime (51085651).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51085651) 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, 9339 + ... + 13761.

It is an arithmetic number, because the mean of its divisors is an integer number (1645728).

Almost surely, 2^51085650 is an apocalyptic number.

51085650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51085650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78994944).

51085650 is an abundant number, since it is smaller than the sum of its proper divisors (106904238).

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

51085650 is a wasteful number, since it uses less digits than its factorization.

51085650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4456 (or 4451 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 51085650 is about 7147.4226123827. The cubic root of 51085650 is about 371.0504601728.

The spelling of 51085650 in words is "fifty-one million, eighty-five thousand, six hundred fifty".