77420145 has 32 divisors (see below), whose sum is σ = 135613440. Its totient is φ = 37403840.

The previous prime is 77420143. The next prime is 77420149. The reversal of 77420145 is 54102477.

It is not a de Polignac number, because 77420145 - 2¹ = 77420143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77420143) 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, 58582 + ... + 59888.

It is an arithmetic number, because the mean of its divisors is an integer number (4237920).

Almost surely, 2^77420145 is an apocalyptic number.

It is an amenable number.

77420145 is a deficient number, since it is larger than the sum of its proper divisors (58193295).

77420145 is a wasteful number, since it uses less digits than its factorization.

77420145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 77420145 is about 8798.8718026802. The cubic root of 77420145 is about 426.2044633346.

The spelling of 77420145 in words is "seventy-seven million, four hundred twenty thousand, one hundred forty-five".