51549400 has 48 divisors (see below), whose sum is σ = 136977840. Its totient is φ = 17673600.

The previous prime is 51549397. The next prime is 51549403. The reversal of 51549400 is 494515.

It is an interprime number because it is at equal distance from previous prime (51549397) and next prime (51549403).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51549403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17011 + ... + 19810.

It is an arithmetic number, because the mean of its divisors is an integer number (2853705).

Almost surely, 2^51549400 is an apocalyptic number.

51549400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51549400 is an abundant number, since it is smaller than the sum of its proper divisors (85428440).

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

51549400 is a wasteful number, since it uses less digits than its factorization.

51549400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36844 (or 36835 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51549400 is about 7179.7910833115. The cubic root of 51549400 is about 372.1698649986.

The spelling of 51549400 in words is "fifty-one million, five hundred forty-nine thousand, four hundred".