78947954 has 4 divisors (see below), whose sum is σ = 118421934. Its totient is φ = 39473976.

The previous prime is 78947951. The next prime is 78947977. The reversal of 78947954 is 45974987.

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

It can be written as a sum of positive squares in only one way, i.e., 78765625 + 182329 = 8875^2 + 427^2 .

It is a super-2 number, since 2×78947954² = 12465558881572232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78947896 and 78947905.

It is not an unprimeable number, because it can be changed into a prime (78947951) 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 as a sum of consecutive naturals, namely, 19736987 + ... + 19736990.

Almost surely, 2^78947954 is an apocalyptic number.

78947954 is a deficient number, since it is larger than the sum of its proper divisors (39473980).

78947954 is a wasteful number, since it uses less digits than its factorization.

78947954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39473979.

The product of its digits is 2540160, while the sum is 53.

The square root of 78947954 is about 8885.2661186934. The cubic root of 78947954 is about 428.9897936980.

The spelling of 78947954 in words is "seventy-eight million, nine hundred forty-seven thousand, nine hundred fifty-four".