120778715 has 4 divisors (see below), whose sum is σ = 144934464. Its totient is φ = 96622968.

The previous prime is 120778657. The next prime is 120778717. The reversal of 120778715 is 517877021.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120778715 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120778717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12077867 + ... + 12077876.

It is an arithmetic number, because the mean of its divisors is an integer number (36233616).

Almost surely, 2^120778715 is an apocalyptic number.

120778715 is a deficient number, since it is larger than the sum of its proper divisors (24155749).

120778715 is an equidigital number, since it uses as much as digits as its factorization.

120778715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24155748.

The product of its (nonzero) digits is 27440, while the sum is 38.

The square root of 120778715 is about 10989.9369879904. The cubic root of 120778715 is about 494.3070465719.

The spelling of 120778715 in words is "one hundred twenty million, seven hundred seventy-eight thousand, seven hundred fifteen".