76649081 has 4 divisors (see below), whose sum is σ = 79121664. Its totient is φ = 74176500.

The previous prime is 76649063. The next prime is 76649099. The reversal of 76649081 is 18094667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18094667 = 4211 ⋅4297.

It is an interprime number because it is at equal distance from previous prime (76649063) and next prime (76649099).

It is a cyclic number.

It is not a de Polignac number, because 76649081 - 2¹⁰ = 76648057 is a prime.

It is a super-2 number, since 2×76649081² = 11750163236289122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76649011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1236245 + ... + 1236306.

It is an arithmetic number, because the mean of its divisors is an integer number (19780416).

Almost surely, 2^76649081 is an apocalyptic number.

It is an amenable number.

76649081 is a deficient number, since it is larger than the sum of its proper divisors (2472583).

76649081 is a wasteful number, since it uses less digits than its factorization.

76649081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472582.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 76649081 is about 8754.9460877838. The cubic root of 76649081 is about 424.7848156345.

The spelling of 76649081 in words is "seventy-six million, six hundred forty-nine thousand, eighty-one".