51140646 has 40 divisors (see below), whose sum is σ = 115913160. Its totient is φ = 16850592.

The previous prime is 51140611. The next prime is 51140689. The reversal of 51140646 is 64604115.

51140646 is a `hidden beast` number, since 5 + 1 + 14 + 0 + 646 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12645 + ... + 16191.

It is an arithmetic number, because the mean of its divisors is an integer number (2897829).

Almost surely, 2^51140646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51140646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57956580).

51140646 is an abundant number, since it is smaller than the sum of its proper divisors (64772514).

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

51140646 is a wasteful number, since it uses less digits than its factorization.

51140646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650 (or 3641 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51140646 is about 7151.2688384650. The cubic root of 51140646 is about 371.1835632570.

The spelling of 51140646 in words is "fifty-one million, one hundred forty thousand, six hundred forty-six".