2794521780 has 72 divisors (see below), whose sum is σ = 8769033000. Its totient is φ = 719507712.

The previous prime is 2794521739. The next prime is 2794521787. The reversal of 2794521780 is 871254972.

It is a happy number.

2794521780 is a `hidden beast` number, since 27 + 9 + 452 + 178 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 339517476 + 2455004304 = 18426^2 + 49548^2 .

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 (2794521787) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262455 + ... + 272894.

It is an arithmetic number, because the mean of its divisors is an integer number (121792125).

Almost surely, 2^2794521780 is an apocalyptic number.

2794521780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2794521780 is an abundant number, since it is smaller than the sum of its proper divisors (5974511220).

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

2794521780 is a wasteful number, since it uses less digits than its factorization.

2794521780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535393 (or 535388 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 2794521780 is about 52863.2365637973. The cubic root of 2794521780 is about 1408.5399402623.

The spelling of 2794521780 in words is "two billion, seven hundred ninety-four million, five hundred twenty-one thousand, seven hundred eighty".