51858366 has 24 divisors (see below), whose sum is σ = 120650760. Its totient is φ = 14816592.

The previous prime is 51858361. The next prime is 51858379. The reversal of 51858366 is 66385815.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51858361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87901 + ... + 88488.

It is an arithmetic number, because the mean of its divisors is an integer number (5027115).

Almost surely, 2^51858366 is an apocalyptic number.

51858366 is an abundant number, since it is smaller than the sum of its proper divisors (68792394).

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

51858366 is a wasteful number, since it uses less digits than its factorization.

51858366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176408 (or 176401 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 51858366 is about 7201.2753037223. The cubic root of 51858366 is about 372.9119290279.

The spelling of 51858366 in words is "fifty-one million, eight hundred fifty-eight thousand, three hundred sixty-six".