77821260 has 48 divisors (see below), whose sum is σ = 237710592. Its totient is φ = 18865600.

The previous prime is 77821243. The next prime is 77821273. The reversal of 77821260 is 6212877.

It is a super-2 number, since 2×77821260² = 12112297015975200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 58296 + ... + 59615.

It is an arithmetic number, because the mean of its divisors is an integer number (4952304).

Almost surely, 2^77821260 is an apocalyptic number.

It is an amenable number.

77821260 is an abundant number, since it is smaller than the sum of its proper divisors (159889332).

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

77821260 is a wasteful number, since it uses less digits than its factorization.

77821260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117934 (or 117932 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 77821260 is about 8821.6359027110. The cubic root of 77821260 is about 426.9392531689.

The spelling of 77821260 in words is "seventy-seven million, eight hundred twenty-one thousand, two hundred sixty".