1961486280 has 576 divisors, whose sum is σ = 7688640960. Its totient is φ = 446777856.

The previous prime is 1961486279. The next prime is 1961486327. The reversal of 1961486280 is 826841691.

1961486280 is a `hidden beast` number, since 1 + 9 + 6 + 14 + 8 + 628 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 45615939 + ... + 45615981.

It is an arithmetic number, because the mean of its divisors is an integer number (13348335).

Almost surely, 2^1961486280 is an apocalyptic number.

1961486280 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 1961486280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3844320480).

1961486280 is an abundant number, since it is smaller than the sum of its proper divisors (5727154680).

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

1961486280 is a wasteful number, since it uses less digits than its factorization.

1961486280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1961486280 is about 44288.6698829396. The cubic root of 1961486280 is about 1251.7812003879.

The spelling of 1961486280 in words is "one billion, nine hundred sixty-one million, four hundred eighty-six thousand, two hundred eighty".