78400945 has 8 divisors (see below), whose sum is σ = 107521344. Its totient is φ = 53760624.

The previous prime is 78400937. The next prime is 78400981. The reversal of 78400945 is 54900487.

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

It is a cyclic number.

It is not a de Polignac number, because 78400945 - 2³ = 78400937 is a prime.

It is a super-2 number, since 2×78400945² = 12293416353786050, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1119979 + ... + 1120048.

It is an arithmetic number, because the mean of its divisors is an integer number (13440168).

Almost surely, 2^78400945 is an apocalyptic number.

It is an amenable number.

78400945 is a deficient number, since it is larger than the sum of its proper divisors (29120399).

78400945 is a wasteful number, since it uses less digits than its factorization.

78400945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240039.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 78400945 is about 8854.4308117462. The cubic root of 78400945 is about 427.9967118419.

It can be divided in two parts, 78400 and 945, that multiplied together give a cube (74088000 = 420³).

The spelling of 78400945 in words is "seventy-eight million, four hundred thousand, nine hundred forty-five".