771223140 has 96 divisors (see below), whose sum is σ = 2444722560. Its totient is φ = 201771648.

The previous prime is 771223067. The next prime is 771223157. The reversal of 771223140 is 41322177.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15147 + ... + 42093.

It is an arithmetic number, because the mean of its divisors is an integer number (25465860).

Almost surely, 2^771223140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 771223140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1222361280).

771223140 is an abundant number, since it is smaller than the sum of its proper divisors (1673499420).

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

771223140 is a wasteful number, since it uses less digits than its factorization.

771223140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27018 (or 27010 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 771223140 is about 27770.9045585483. The cubic root of 771223140 is about 917.0507082093.

The spelling of 771223140 in words is "seven hundred seventy-one million, two hundred twenty-three thousand, one hundred forty".