1961057790 has 80 divisors (see below), whose sum is σ = 5291703648. Its totient is φ = 521100864.

The previous prime is 1961057783. The next prime is 1961057821. The reversal of 1961057790 is 977501691.

1961057790 is a `hidden beast` number, since 19 + 61 + 0 + 577 + 9 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 233199 + ... + 241461.

Almost surely, 2^1961057790 is an apocalyptic number.

1961057790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1961057790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2645851824).

1961057790 is an abundant number, since it is smaller than the sum of its proper divisors (3330645858).

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

1961057790 is a wasteful number, since it uses less digits than its factorization.

1961057790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8575 (or 8566 counting only the distinct ones).

The product of its (nonzero) digits is 119070, while the sum is 45.

The square root of 1961057790 is about 44283.8321512491. The cubic root of 1961057790 is about 1251.6900425086.

The spelling of 1961057790 in words is "one billion, nine hundred sixty-one million, fifty-seven thousand, seven hundred ninety".