51778004 has 6 divisors (see below), whose sum is σ = 90611514. Its totient is φ = 25889000.

The previous prime is 51778003. The next prime is 51778061. The reversal of 51778004 is 40087715.

It can be written as a sum of positive squares in only one way, i.e., 37185604 + 14592400 = 6098^2 + 3820^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51778003) 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 as a sum of consecutive naturals, namely, 6472247 + ... + 6472254.

It is an arithmetic number, because the mean of its divisors is an integer number (15101919).

Almost surely, 2^51778004 is an apocalyptic number.

It is an amenable number.

51778004 is a deficient number, since it is larger than the sum of its proper divisors (38833510).

51778004 is a wasteful number, since it uses less digits than its factorization.

51778004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12944505 (or 12944503 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 51778004 is about 7195.6934342703. The cubic root of 51778004 is about 372.7192025437.

The spelling of 51778004 in words is "fifty-one million, seven hundred seventy-eight thousand, four".