51530700 has 144 divisors (see below), whose sum is σ = 163663136. Its totient is φ = 12441600.

The previous prime is 51530693. The next prime is 51530707. The reversal of 51530700 is 703515.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51530693) and next prime (51530707).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51530707) 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, 284610 + ... + 284790.

Almost surely, 2^51530700 is an apocalyptic number.

51530700 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 51530700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81831568).

51530700 is an abundant number, since it is smaller than the sum of its proper divisors (112132436).

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

51530700 is a wasteful number, since it uses less digits than its factorization.

51530700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 525, while the sum is 21.

The square root of 51530700 is about 7178.4886988836. The cubic root of 51530700 is about 372.1248569210.

The spelling of 51530700 in words is "fifty-one million, five hundred thirty thousand, seven hundred".