77457245 has 8 divisors (see below), whose sum is σ = 93066840. Its totient is φ = 61887040.

The previous prime is 77457239. The next prime is 77457257. The reversal of 77457245 is 54275477.

It can be written as a sum of positive squares in 4 ways, for example, as 19377604 + 58079641 = 4402^2 + 7621^2 .

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

It is not a de Polignac number, because 77457245 - 2⁶ = 77457181 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5330 + ... + 13539.

It is an arithmetic number, because the mean of its divisors is an integer number (11633355).

Almost surely, 2^77457245 is an apocalyptic number.

It is an amenable number.

77457245 is a deficient number, since it is larger than the sum of its proper divisors (15609595).

77457245 is a wasteful number, since it uses less digits than its factorization.

77457245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19695.

The product of its digits is 274400, while the sum is 41.

The square root of 77457245 is about 8800.9797750023. The cubic root of 77457245 is about 426.2725320115.

The spelling of 77457245 in words is "seventy-seven million, four hundred fifty-seven thousand, two hundred forty-five".