82777740 has 24 divisors (see below), whose sum is σ = 231777840. Its totient is φ = 22074048.

The previous prime is 82777733. The next prime is 82777741. The reversal of 82777740 is 4777728.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 82777692 and 82777701.

It is not an unprimeable number, because it can be changed into a prime (82777741) 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, 689755 + ... + 689874.

It is an arithmetic number, because the mean of its divisors is an integer number (9657410).

Almost surely, 2^82777740 is an apocalyptic number.

It is an amenable number.

82777740 is an abundant number, since it is smaller than the sum of its proper divisors (149000100).

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

82777740 is a wasteful number, since it uses less digits than its factorization.

82777740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379641 (or 1379639 counting only the distinct ones).

The product of its (nonzero) digits is 153664, while the sum is 42.

The square root of 82777740 is about 9098.2272998645. The cubic root of 82777740 is about 435.8173560951.

The spelling of 82777740 in words is "eighty-two million, seven hundred seventy-seven thousand, seven hundred forty".