75807981 has 32 divisors (see below), whose sum is σ = 120441600. Its totient is φ = 47542464.

The previous prime is 75807973. The next prime is 75808003. The reversal of 75807981 is 18970857.

It is not a de Polignac number, because 75807981 - 2³ = 75807973 is a prime.

It is a super-2 number, since 2×75807981² = 11493699966592722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75807911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36160 + ... + 38198.

It is an arithmetic number, because the mean of its divisors is an integer number (3763800).

Almost surely, 2^75807981 is an apocalyptic number.

It is an amenable number.

75807981 is a deficient number, since it is larger than the sum of its proper divisors (44633619).

75807981 is an equidigital number, since it uses as much as digits as its factorization.

75807981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077 (or 2059 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 75807981 is about 8706.7778770335. Note that the first 3 decimals coincide. The cubic root of 75807981 is about 423.2253213319.

The spelling of 75807981 in words is "seventy-five million, eight hundred seven thousand, nine hundred eighty-one".