75757978 has 8 divisors (see below), whose sum is σ = 119617920. Its totient is φ = 35885340.

The previous prime is 75757963. The next prime is 75757987. The reversal of 75757978 is 87975757.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996778 + ... + 996853.

It is an arithmetic number, because the mean of its divisors is an integer number (14952240).

Almost surely, 2^75757978 is an apocalyptic number.

75757978 is a deficient number, since it is larger than the sum of its proper divisors (43859942).

75757978 is a wasteful number, since it uses less digits than its factorization.

75757978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993652.

The product of its digits is 4321800, while the sum is 55.

The square root of 75757978 is about 8703.9059048223. The cubic root of 75757978 is about 423.1322476207.

The spelling of 75757978 in words is "seventy-five million, seven hundred fifty-seven thousand, nine hundred seventy-eight".