1561628958 has 16 divisors (see below), whose sum is σ = 3127838976. Its totient is φ = 519779480.

The previous prime is 1561628927. The next prime is 1561628963. The reversal of 1561628958 is 8598261651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561628958.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186438 + ... + 194633.

It is an arithmetic number, because the mean of its divisors is an integer number (195489936).

Almost surely, 2^1561628958 is an apocalyptic number.

1561628958 is an abundant number, since it is smaller than the sum of its proper divisors (1566210018).

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

1561628958 is a wasteful number, since it uses less digits than its factorization.

1561628958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381759.

The product of its digits is 1036800, while the sum is 51.

The square root of 1561628958 is about 39517.4513095164. The cubic root of 1561628958 is about 1160.1815406519.

The spelling of 1561628958 in words is "one billion, five hundred sixty-one million, six hundred twenty-eight thousand, nine hundred fifty-eight".