78401755 has 8 divisors (see below), whose sum is σ = 95014224. Its totient is φ = 62100000.

The previous prime is 78401753. The next prime is 78401777. The reversal of 78401755 is 55710487.

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

It is not a de Polignac number, because 78401755 - 2¹ = 78401753 is a prime.

It is a super-2 number, since 2×78401755² = 12293670374160050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78401753) 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 7 ways as a sum of consecutive naturals, for example, 77121 + ... + 78130.

It is an arithmetic number, because the mean of its divisors is an integer number (11876778).

Almost surely, 2^78401755 is an apocalyptic number.

78401755 is a deficient number, since it is larger than the sum of its proper divisors (16612469).

78401755 is a wasteful number, since it uses less digits than its factorization.

78401755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155357.

The product of its (nonzero) digits is 39200, while the sum is 37.

The square root of 78401755 is about 8854.4765514400. The cubic root of 78401755 is about 427.9981857873.

The spelling of 78401755 in words is "seventy-eight million, four hundred one thousand, seven hundred fifty-five".