78711154 has 4 divisors (see below), whose sum is σ = 118066734. Its totient is φ = 39355576.

The previous prime is 78711121. The next prime is 78711161. The reversal of 78711154 is 45111787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45111787 = 7 ⋅6444541.

It can be written as a sum of positive squares in only one way, i.e., 66994225 + 11716929 = 8185^2 + 3423^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19677787 + ... + 19677790.

Almost surely, 2^78711154 is an apocalyptic number.

78711154 is a deficient number, since it is larger than the sum of its proper divisors (39355580).

78711154 is a wasteful number, since it uses less digits than its factorization.

78711154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39355579.

The product of its digits is 7840, while the sum is 34.

The square root of 78711154 is about 8871.9306805227. The cubic root of 78711154 is about 428.5604538036.

It can be divided in two parts, 7871 and 1154, that added together give a square (9025 = 95²).

The spelling of 78711154 in words is "seventy-eight million, seven hundred eleven thousand, one hundred fifty-four".