77421723 has 32 divisors (see below), whose sum is σ = 113762880. Its totient is φ = 46632960.

The previous prime is 77421691. The next prime is 77421761. The reversal of 77421723 is 32712477.

It is not a de Polignac number, because 77421723 - 2⁵ = 77421691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77421623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167713 + ... + 168173.

It is an arithmetic number, because the mean of its divisors is an integer number (3555090).

Almost surely, 2^77421723 is an apocalyptic number.

77421723 is a deficient number, since it is larger than the sum of its proper divisors (36341157).

77421723 is a wasteful number, since it uses less digits than its factorization.

77421723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607.

The product of its digits is 16464, while the sum is 33.

The square root of 77421723 is about 8798.9614728103. The cubic root of 77421723 is about 426.2073589895.

The spelling of 77421723 in words is "seventy-seven million, four hundred twenty-one thousand, seven hundred twenty-three".