51073400 has 72 divisors (see below), whose sum is σ = 136423560. Its totient is φ = 17419200.

The previous prime is 51073391. The next prime is 51073403. The reversal of 51073400 is 437015.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51073403) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 267305 + ... + 267495.

Almost surely, 2^51073400 is an apocalyptic number.

51073400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51073400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68211780).

51073400 is an abundant number, since it is smaller than the sum of its proper divisors (85350160).

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

51073400 is a wasteful number, since it uses less digits than its factorization.

51073400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 51073400 is about 7146.5656087382. The cubic root of 51073400 is about 371.0207993221.

The spelling of 51073400 in words is "fifty-one million, seventy-three thousand, four hundred".