1620871280378 has 32 divisors (see below), whose sum is σ = 3002128272000. Its totient is φ = 653796814272.

The previous prime is 1620871280359. The next prime is 1620871280387. The reversal of 1620871280378 is 8730821780261.

It is a super-3 number, since 3×1620871280378³ (a number of 38 digits) contains 333 as substring.

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, 69482048 + ... + 69505371.

It is an arithmetic number, because the mean of its divisors is an integer number (93816508500).

Almost surely, 2^{1620871280378} is an apocalyptic number.

1620871280378 is a deficient number, since it is larger than the sum of its proper divisors (1381256991622).

1620871280378 is a wasteful number, since it uses less digits than its factorization.

1620871280378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138987459 (or 138987445 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 53.

The spelling of 1620871280378 in words is "one trillion, six hundred twenty billion, eight hundred seventy-one million, two hundred eighty thousand, three hundred seventy-eight".