78461577 has 12 divisors (see below), whose sum is σ = 116098164. Its totient is φ = 51031680.

The previous prime is 78461573. The next prime is 78461611. The reversal of 78461577 is 77516487.

78461577 is a `hidden beast` number, since 78 + 4 + 6 + 1 + 577 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26101881 + 52359696 = 5109^2 + 7236^2 .

It is not a de Polignac number, because 78461577 - 2² = 78461573 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78461573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105948 + ... + 106685.

It is an arithmetic number, because the mean of its divisors is an integer number (9674847).

Almost surely, 2^78461577 is an apocalyptic number.

It is an amenable number.

78461577 is a deficient number, since it is larger than the sum of its proper divisors (37636587).

78461577 is a wasteful number, since it uses less digits than its factorization.

78461577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212680 (or 212677 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 78461577 is about 8857.8539726053. The cubic root of 78461577 is about 428.1070149761.

The spelling of 78461577 in words is "seventy-eight million, four hundred sixty-one thousand, five hundred seventy-seven".