1645787450 has 24 divisors (see below), whose sum is σ = 3062846748. Its totient is φ = 657953280.

The previous prime is 1645787443. The next prime is 1645787509. The reversal of 1645787450 is 547875461.

1645787450 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 131721529 + 1514065921 = 11477^2 + 38911^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1645787395 and 1645787404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94634 + ... + 110666.

Almost surely, 2^1645787450 is an apocalyptic number.

1645787450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645787450 is a deficient number, since it is larger than the sum of its proper divisors (1417059298).

1645787450 is a wasteful number, since it uses less digits than its factorization.

1645787450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18098 (or 18093 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 47.

The square root of 1645787450 is about 40568.3059789289. The cubic root of 1645787450 is about 1180.6592720218.

The spelling of 1645787450 in words is "one billion, six hundred forty-five million, seven hundred eighty-seven thousand, four hundred fifty".