77941220 has 24 divisors (see below), whose sum is σ = 187059264. Its totient is φ = 26722656.

The previous prime is 77941187. The next prime is 77941229. The reversal of 77941220 is 2214977.

It is not an unprimeable number, because it can be changed into a prime (77941229) 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, 278222 + ... + 278501.

It is an arithmetic number, because the mean of its divisors is an integer number (7794136).

Almost surely, 2^77941220 is an apocalyptic number.

77941220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77941220 is an abundant number, since it is smaller than the sum of its proper divisors (109118044).

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

77941220 is a wasteful number, since it uses less digits than its factorization.

77941220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556739 (or 556737 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 77941220 is about 8828.4324769463. The cubic root of 77941220 is about 427.1585134728.

The spelling of 77941220 in words is "seventy-seven million, nine hundred forty-one thousand, two hundred twenty".