77229420 has 24 divisors (see below), whose sum is σ = 216242544. Its totient is φ = 20594496.

The previous prime is 77229391. The next prime is 77229421. The reversal of 77229420 is 2492277.

It is not an unprimeable number, because it can be changed into a prime (77229421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643519 + ... + 643638.

It is an arithmetic number, because the mean of its divisors is an integer number (9010106).

Almost surely, 2^77229420 is an apocalyptic number.

It is an amenable number.

77229420 is an abundant number, since it is smaller than the sum of its proper divisors (139013124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77229420 is a wasteful number, since it uses less digits than its factorization.

77229420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287169 (or 1287167 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 77229420 is about 8788.0270823433. The cubic root of 77229420 is about 425.8541897772.

The spelling of 77229420 in words is "seventy-seven million, two hundred twenty-nine thousand, four hundred twenty".