45720945 has 24 divisors (see below), whose sum is σ = 81185832. Its totient is φ = 23788800.

The previous prime is 45720943. The next prime is 45720949. The reversal of 45720945 is 54902754.

It can be written as a sum of positive squares in 4 ways, for example, as 36864 + 45684081 = 192^2 + 6759^2 .

It is not a de Polignac number, because 45720945 - 2¹ = 45720943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (45720943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10546 + ... + 14235.

It is an arithmetic number, because the mean of its divisors is an integer number (3382743).

Almost surely, 2^45720945 is an apocalyptic number.

45720945 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

45720945 is a deficient number, since it is larger than the sum of its proper divisors (35464887).

45720945 is a wasteful number, since it uses less digits than its factorization.

45720945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24833 (or 24830 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 45720945 is about 6761.7264807148. The cubic root of 45720945 is about 357.5787754095.

It can be divided in two parts, 45720 and 945, that added together give a triangular number (46665 = T₃₀₅).

The spelling of 45720945 in words is "forty-five million, seven hundred twenty thousand, nine hundred forty-five".