77972011 has 4 divisors (see below), whose sum is σ = 83969872. Its totient is φ = 71974152.

The previous prime is 77971939. The next prime is 77972023. The reversal of 77972011 is 11027977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77972011 - 2¹⁵ = 77939243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77972051) 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, 2998911 + ... + 2998936.

It is an arithmetic number, because the mean of its divisors is an integer number (20992468).

Almost surely, 2^77972011 is an apocalyptic number.

77972011 is a deficient number, since it is larger than the sum of its proper divisors (5997861).

77972011 is a wasteful number, since it uses less digits than its factorization.

77972011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5997860.

The product of its (nonzero) digits is 6174, while the sum is 34.

The square root of 77972011 is about 8830.1761590582. The cubic root of 77972011 is about 427.2147563105.

Adding to 77972011 its reverse (11027977), we get a palindrome (88999988).

It can be divided in two parts, 77 and 972011, that multiplied together give a palindrome (74844847).

The spelling of 77972011 in words is "seventy-seven million, nine hundred seventy-two thousand, eleven".