42720777 has 20 divisors (see below), whose sum is σ = 69620496. Its totient is φ = 25890840.

The previous prime is 42720761. The next prime is 42720787. The reversal of 42720777 is 77702724.

42720777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42720777 - 2⁴ = 42720761 is a prime.

It is a super-3 number, since 3×42720777³ (a number of 24 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (42720737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23083 + ... + 24864.

Almost surely, 2^42720777 is an apocalyptic number.

It is an amenable number.

42720777 is a deficient number, since it is larger than the sum of its proper divisors (26899719).

42720777 is a wasteful number, since it uses less digits than its factorization.

42720777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47970 (or 47961 counting only the distinct ones).

The product of its (nonzero) digits is 38416, while the sum is 36.

The square root of 42720777 is about 6536.1132946117. The cubic root of 42720777 is about 349.5798413993.

The spelling of 42720777 in words is "forty-two million, seven hundred twenty thousand, seven hundred seventy-seven".