51440765 has 8 divisors (see below), whose sum is σ = 64412928. Its totient is φ = 39363280.

The previous prime is 51440737. The next prime is 51440777. The reversal of 51440765 is 56704415.

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

It is not a de Polignac number, because 51440765 - 2²² = 47246461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223541 + ... + 223770.

It is an arithmetic number, because the mean of its divisors is an integer number (8051616).

Almost surely, 2^51440765 is an apocalyptic number.

It is an amenable number.

51440765 is a deficient number, since it is larger than the sum of its proper divisors (12972163).

51440765 is a wasteful number, since it uses less digits than its factorization.

51440765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447339.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 51440765 is about 7172.2217617695. The cubic root of 51440765 is about 371.9082447035.

The spelling of 51440765 in words is "fifty-one million, four hundred forty thousand, seven hundred sixty-five".