78857954 has 24 divisors (see below), whose sum is σ = 138836268. Its totient is φ = 33492480.

The previous prime is 78857953. The next prime is 78857971. The reversal of 78857954 is 45975887.

78857954 = 31² + 32² + ... + 618².

It can be written as a sum of positive squares in 2 ways, for example, as 50481025 + 28376929 = 7105^2 + 5327^2 .

It is a super-2 number, since 2×78857954² = 12437153818132232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78857896 and 78857905.

It is not an unprimeable number, because it can be changed into a prime (78857953) 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, 7514 + ... + 14634.

Almost surely, 2^78857954 is an apocalyptic number.

78857954 is a deficient number, since it is larger than the sum of its proper divisors (59978314).

78857954 is a wasteful number, since it uses less digits than its factorization.

78857954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7250 (or 7243 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 53.

The square root of 78857954 is about 8880.2001103579. The cubic root of 78857954 is about 428.8267168011.

The spelling of 78857954 in words is "seventy-eight million, eight hundred fifty-seven thousand, nine hundred fifty-four".