77421020 has 24 divisors (see below), whose sum is σ = 166979904. Its totient is φ = 30131136.

The previous prime is 77420977. The next prime is 77421031. The reversal of 77421020 is 2012477.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51572 + ... + 53051.

It is an arithmetic number, because the mean of its divisors is an integer number (6957496).

Almost surely, 2^77421020 is an apocalyptic number.

It is an amenable number.

77421020 is an abundant number, since it is smaller than the sum of its proper divisors (89558884).

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

77421020 is a wasteful number, since it uses less digits than its factorization.

77421020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104669 (or 104667 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 77421020 is about 8798.9215248234. The cubic root of 77421020 is about 426.2060689783.

Adding to 77421020 its reverse (2012477), we get a palindrome (79433497).

The spelling of 77421020 in words is "seventy-seven million, four hundred twenty-one thousand, twenty".