51781148 has 12 divisors (see below), whose sum is σ = 90794592. Its totient is φ = 25839840.

The previous prime is 51781141. The next prime is 51781157. The reversal of 51781148 is 84118715.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51781141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10340 + ... + 14507.

It is an arithmetic number, because the mean of its divisors is an integer number (7566216).

Almost surely, 2^51781148 is an apocalyptic number.

It is an amenable number.

51781148 is a deficient number, since it is larger than the sum of its proper divisors (39013444).

51781148 is a wasteful number, since it uses less digits than its factorization.

51781148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25372 (or 25370 counting only the distinct ones).

The product of its digits is 8960, while the sum is 35.

The square root of 51781148 is about 7195.9118949581. The cubic root of 51781148 is about 372.7267463227.

The spelling of 51781148 in words is "fifty-one million, seven hundred eighty-one thousand, one hundred forty-eight".