1861790201628 has 48 divisors (see below), whose sum is σ = 5256819396864. Its totient is φ = 500649465600.

The previous prime is 1861790201597. The next prime is 1861790201647. The reversal of 1861790201628 is 8261020971681.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 651885898 + ... + 651888753.

It is an arithmetic number, because the mean of its divisors is an integer number (109517070768).

Almost surely, 2^{1861790201628} is an apocalyptic number.

It is an amenable number.

1861790201628 is an abundant number, since it is smaller than the sum of its proper divisors (3395029195236).

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

1861790201628 is a wasteful number, since it uses less digits than its factorization.

1861790201628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303774682 (or 1303774680 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 1861790201628 in words is "one trillion, eight hundred sixty-one billion, seven hundred ninety million, two hundred one thousand, six hundred twenty-eight".