51438777 has 8 divisors (see below), whose sum is σ = 73860864. Its totient is φ = 31654608.

The previous prime is 51438773. The next prime is 51438791. The reversal of 51438777 is 77783415.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51438777 - 2² = 51438773 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51438773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659433 + ... + 659510.

It is an arithmetic number, because the mean of its divisors is an integer number (9232608).

Almost surely, 2^51438777 is an apocalyptic number.

It is an amenable number.

51438777 is a deficient number, since it is larger than the sum of its proper divisors (22422087).

51438777 is a wasteful number, since it uses less digits than its factorization.

51438777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318959.

The product of its digits is 164640, while the sum is 42.

The square root of 51438777 is about 7172.0831701815. The cubic root of 51438777 is about 371.9034536711.

The spelling of 51438777 in words is "fifty-one million, four hundred thirty-eight thousand, seven hundred seventy-seven".