72051420 has 96 divisors (see below), whose sum is σ = 242726400. Its totient is φ = 15600384.

The previous prime is 72051383. The next prime is 72051437. The reversal of 72051420 is 2415027.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3466 + ... + 12494.

It is an arithmetic number, because the mean of its divisors is an integer number (2528400).

Almost surely, 2^72051420 is an apocalyptic number.

72051420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72051420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121363200).

72051420 is an abundant number, since it is smaller than the sum of its proper divisors (170674980).

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

72051420 is a wasteful number, since it uses less digits than its factorization.

72051420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9067 (or 9065 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 72051420 is about 8488.3107860163. The cubic root of 72051420 is about 416.1157761459.

Adding to 72051420 its reverse (2415027), we get a palindrome (74466447).

The spelling of 72051420 in words is "seventy-two million, fifty-one thousand, four hundred twenty".