76542649 has 4 divisors (see below), whose sum is σ = 78171264. Its totient is φ = 74914036.

The previous prime is 76542611. The next prime is 76542667. The reversal of 76542649 is 94624567.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 76542649 - 2¹³ = 76534457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76542679) 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, 814237 + ... + 814330.

It is an arithmetic number, because the mean of its divisors is an integer number (19542816).

Almost surely, 2^76542649 is an apocalyptic number.

It is an amenable number.

76542649 is a deficient number, since it is larger than the sum of its proper divisors (1628615).

76542649 is a wasteful number, since it uses less digits than its factorization.

76542649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628614.

The product of its digits is 362880, while the sum is 43.

The square root of 76542649 is about 8748.8655836057. The cubic root of 76542649 is about 424.5881112122.

The spelling of 76542649 in words is "seventy-six million, five hundred forty-two thousand, six hundred forty-nine".