2780645442 has 32 divisors (see below), whose sum is σ = 5636327424. Its totient is φ = 914457600.

The previous prime is 2780645437. The next prime is 2780645447. The reversal of 2780645442 is 2445460872.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2780645437) and next prime (2780645447).

It is a junction number, because it is equal to n+sod(n) for n = 2780645394 and 2780645403.

It is not an unprimeable number, because it can be changed into a prime (2780645447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127842 + ... + 148002.

It is an arithmetic number, because the mean of its divisors is an integer number (176135232).

Almost surely, 2^2780645442 is an apocalyptic number.

2780645442 is an abundant number, since it is smaller than the sum of its proper divisors (2855681982).

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

2780645442 is a wasteful number, since it uses less digits than its factorization.

2780645442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20474.

The product of its (nonzero) digits is 430080, while the sum is 42.

The square root of 2780645442 is about 52731.8257032696. The cubic root of 2780645442 is about 1406.2046788041.

The spelling of 2780645442 in words is "two billion, seven hundred eighty million, six hundred forty-five thousand, four hundred forty-two".