51767998 has 4 divisors (see below), whose sum is σ = 77652000. Its totient is φ = 25883998.

The previous prime is 51767993. The next prime is 51768011. The reversal of 51767998 is 89976715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51767993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12941998 + ... + 12942001.

It is an arithmetic number, because the mean of its divisors is an integer number (19413000).

Almost surely, 2^51767998 is an apocalyptic number.

51767998 is a deficient number, since it is larger than the sum of its proper divisors (25884002).

51767998 is a wasteful number, since it uses less digits than its factorization.

51767998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25884001.

The product of its digits is 952560, while the sum is 52.

The square root of 51767998 is about 7194.9981236968. The cubic root of 51767998 is about 372.6951919065.

The spelling of 51767998 in words is "fifty-one million, seven hundred sixty-seven thousand, nine hundred ninety-eight".