51890004 has 24 divisors (see below), whose sum is σ = 134529920. Its totient is φ = 17296632.

The previous prime is 51889991. The next prime is 51890009. The reversal of 51890004 is 40009815.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51890004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51890009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240124 + ... + 240339.

Almost surely, 2^51890004 is an apocalyptic number.

51890004 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

51890004 is an abundant number, since it is smaller than the sum of its proper divisors (82639916).

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

51890004 is a wasteful number, since it uses less digits than its factorization.

51890004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480476 (or 480468 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 51890004 is about 7203.4716630247. The cubic root of 51890004 is about 372.9877495755.

Adding to 51890004 its reverse (40009815), we get a palindrome (91899819).

The spelling of 51890004 in words is "fifty-one million, eight hundred ninety thousand, four".