45215820 has 240 divisors, whose sum is σ = 162217440. Its totient is φ = 10450944.

The previous prime is 45215803. The next prime is 45215851. The reversal of 45215820 is 2851254.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 400084 + ... + 400196.

It is an arithmetic number, because the mean of its divisors is an integer number (675906).

Almost surely, 2^45215820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 45215820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81108720).

45215820 is an abundant number, since it is smaller than the sum of its proper divisors (117001620).

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

45215820 is a wasteful number, since it uses less digits than its factorization.

45215820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 45215820 is about 6724.2709642012. The cubic root of 45215820 is about 356.2570524920.

The spelling of 45215820 in words is "forty-five million, two hundred fifteen thousand, eight hundred twenty".