51812460 has 144 divisors (see below), whose sum is σ = 186391296. Its totient is φ = 11835072.

The previous prime is 51812459. The next prime is 51812461. The reversal of 51812460 is 6421815.

It is an interprime number because it is at equal distance from previous prime (51812459) and next prime (51812461).

It is a super-2 number, since 2×51812460² = 5369062022503200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51812461) 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, 33259 + ... + 34781.

It is an arithmetic number, because the mean of its divisors is an integer number (1294384).

Almost surely, 2^51812460 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51812460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93195648).

51812460 is an abundant number, since it is smaller than the sum of its proper divisors (134578836).

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

51812460 is a wasteful number, since it uses less digits than its factorization.

51812460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554 (or 1540 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 51812460 is about 7198.0872459286. The cubic root of 51812460 is about 372.8018603277.

The spelling of 51812460 in words is "fifty-one million, eight hundred twelve thousand, four hundred sixty".