77230155 has 32 divisors (see below), whose sum is σ = 131408640. Its totient is φ = 38620800.

The previous prime is 77230147. The next prime is 77230157. The reversal of 77230155 is 55103277.

It is not a de Polignac number, because 77230155 - 2³ = 77230147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77230157) 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, 27444 + ... + 30126.

It is an arithmetic number, because the mean of its divisors is an integer number (4106520).

Almost surely, 2^77230155 is an apocalyptic number.

77230155 is a deficient number, since it is larger than the sum of its proper divisors (54178485).

77230155 is a wasteful number, since it uses less digits than its factorization.

77230155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811.

The product of its (nonzero) digits is 7350, while the sum is 30.

The square root of 77230155 is about 8788.0689005037. The cubic root of 77230155 is about 425.8555407384.

The spelling of 77230155 in words is "seventy-seven million, two hundred thirty thousand, one hundred fifty-five".