50778515 has 4 divisors (see below), whose sum is σ = 60934224. Its totient is φ = 40622808.

The previous prime is 50778499. The next prime is 50778517. The reversal of 50778515 is 51587705.

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

It is a cyclic number.

It is not a de Polignac number, because 50778515 - 2⁴ = 50778499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (50778517) 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, 5077847 + ... + 5077856.

It is an arithmetic number, because the mean of its divisors is an integer number (15233556).

Almost surely, 2^50778515 is an apocalyptic number.

50778515 is a deficient number, since it is larger than the sum of its proper divisors (10155709).

50778515 is a wasteful number, since it uses less digits than its factorization.

50778515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10155708.

The product of its (nonzero) digits is 49000, while the sum is 38.

The square root of 50778515 is about 7125.9045039911. The cubic root of 50778515 is about 370.3053602865.

The spelling of 50778515 in words is "fifty million, seven hundred seventy-eight thousand, five hundred fifteen".