77662921 has 4 divisors (see below), whose sum is σ = 88757632. Its totient is φ = 66568212.

The previous prime is 77662903. The next prime is 77662931. The reversal of 77662921 is 12926677.

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 77662921 - 2²¹ = 75565769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77662931) 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, 5547345 + ... + 5547358.

It is an arithmetic number, because the mean of its divisors is an integer number (22189408).

Almost surely, 2^77662921 is an apocalyptic number.

It is an amenable number.

77662921 is a deficient number, since it is larger than the sum of its proper divisors (11094711).

77662921 is a wasteful number, since it uses less digits than its factorization.

77662921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11094710.

The product of its digits is 63504, while the sum is 40.

The square root of 77662921 is about 8812.6568638521. The cubic root of 77662921 is about 426.6494992957.

The spelling of 77662921 in words is "seventy-seven million, six hundred sixty-two thousand, nine hundred twenty-one".