45216720 has 60 divisors (see below), whose sum is σ = 151855236. Its totient is φ = 12057600.

The previous prime is 45216709. The next prime is 45216733. The reversal of 45216720 is 2761254.

It can be written as a sum of positive squares in 2 ways, for example, as 8928144 + 36288576 = 2988^2 + 6024^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 30681 + ... + 32120.

Almost surely, 2^45216720 is an apocalyptic number.

45216720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

45216720 is an abundant number, since it is smaller than the sum of its proper divisors (106638516).

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

45216720 is a wasteful number, since it uses less digits than its factorization.

45216720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62820 (or 62811 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 45216720 is about 6724.3378856212. The cubic root of 45216720 is about 356.2594161869.

Adding to 45216720 its reverse (2761254), we get a palindrome (47977974).

The spelling of 45216720 in words is "forty-five million, two hundred sixteen thousand, seven hundred twenty".