162777780 has 144 divisors (see below), whose sum is σ = 542505600. Its totient is φ = 39179520.

The previous prime is 162777733. The next prime is 162777781. The reversal of 162777780 is 87777261.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162777781) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 453241 + ... + 453599.

It is an arithmetic number, because the mean of its divisors is an integer number (3767400).

Almost surely, 2^162777780 is an apocalyptic number.

162777780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 162777780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271252800).

162777780 is an abundant number, since it is smaller than the sum of its proper divisors (379727820).

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

162777780 is a wasteful number, since it uses less digits than its factorization.

162777780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 230496, while the sum is 45.

The square root of 162777780 is about 12758.4395597581. The cubic root of 162777780 is about 546.0072051539.

The spelling of 162777780 in words is "one hundred sixty-two million, seven hundred seventy-seven thousand, seven hundred eighty".