75783981 has 16 divisors (see below), whose sum is σ = 124363904. Its totient is φ = 39973824.

The previous prime is 75783973. The next prime is 75783991. The reversal of 75783981 is 18938757.

It is not a de Polignac number, because 75783981 - 2³ = 75783973 is a prime.

It is a super-2 number, since 2×75783981² = 11486423552416722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 75783981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75783941) 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 15 ways as a sum of consecutive naturals, for example, 138526 + ... + 139071.

It is an arithmetic number, because the mean of its divisors is an integer number (7772744).

Almost surely, 2^75783981 is an apocalyptic number.

It is an amenable number.

75783981 is a deficient number, since it is larger than the sum of its proper divisors (48579923).

75783981 is a wasteful number, since it uses less digits than its factorization.

75783981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277620.

The product of its digits is 423360, while the sum is 48.

The square root of 75783981 is about 8705.3995313254. The cubic root of 75783981 is about 423.1806537403.

The spelling of 75783981 in words is "seventy-five million, seven hundred eighty-three thousand, nine hundred eighty-one".