1645798770 has 384 divisors, whose sum is σ = 5720647680. Its totient is φ = 332760960.

The previous prime is 1645798733. The next prime is 1645798789. The reversal of 1645798770 is 778975461.

1645798770 is a `hidden beast` number, since 1 + 64 + 579 + 8 + 7 + 7 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6257659 + ... + 6257921.

It is an arithmetic number, because the mean of its divisors is an integer number (14897520).

Almost surely, 2^1645798770 is an apocalyptic number.

1645798770 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 1645798770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2860323840).

1645798770 is an abundant number, since it is smaller than the sum of its proper divisors (4074848910).

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

1645798770 is a wasteful number, since it uses less digits than its factorization.

1645798770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The square root of 1645798770 is about 40568.4454964693. The cubic root of 1645798770 is about 1180.6619789392.

The spelling of 1645798770 in words is "one billion, six hundred forty-five million, seven hundred ninety-eight thousand, seven hundred seventy".