76991481 has 36 divisors (see below), whose sum is σ = 130451776. Its totient is φ = 42863040.

The previous prime is 76991479. The next prime is 76991483. The reversal of 76991481 is 18419967.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (76991479) and next prime (76991483).

It is not a de Polignac number, because 76991481 - 2¹ = 76991479 is a prime.

It is a super-2 number, since 2×76991481² = 11855376293146722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (76991483) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 105540 + ... + 106266.

Almost surely, 2^76991481 is an apocalyptic number.

It is an amenable number.

76991481 is a deficient number, since it is larger than the sum of its proper divisors (53460295).

76991481 is a wasteful number, since it uses less digits than its factorization.

76991481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 778 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 76991481 is about 8774.4789588898. The cubic root of 76991481 is about 425.4163965132.

It can be divided in two parts, 7699 and 1481, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 76991481 in words is "seventy-six million, nine hundred ninety-one thousand, four hundred eighty-one".