77774220 has 72 divisors (see below), whose sum is σ = 248342640. Its totient is φ = 19647360.

The previous prime is 77774219. The next prime is 77774227. The reversal of 77774220 is 2247777.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (77774227) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 7951 + ... + 14790.

Almost surely, 2^77774220 is an apocalyptic number.

It is an amenable number.

77774220 is an abundant number, since it is smaller than the sum of its proper divisors (170568420).

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

77774220 is a wasteful number, since it uses less digits than its factorization.

77774220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22775 (or 22770 counting only the distinct ones).

The product of its (nonzero) digits is 38416, while the sum is 36.

The square root of 77774220 is about 8818.9693275348. The cubic root of 77774220 is about 426.8532129688.

The spelling of 77774220 in words is "seventy-seven million, seven hundred seventy-four thousand, two hundred twenty".