93721428 has 48 divisors (see below), whose sum is σ = 244930560. Its totient is φ = 30989952.

The previous prime is 93721427. The next prime is 93721477. The reversal of 93721428 is 82412739.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 93721392 and 93721401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (93721421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10300 + ... + 17132.

It is an arithmetic number, because the mean of its divisors is an integer number (5102720).

Almost surely, 2^93721428 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 93721428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122465280).

93721428 is an abundant number, since it is smaller than the sum of its proper divisors (151209132).

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

93721428 is a wasteful number, since it uses less digits than its factorization.

93721428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973 (or 6965 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 93721428 is about 9680.9828013482. The cubic root of 93721428 is about 454.2339935015.

It can be divided in two parts, 93721 and 428, that added together give a palindrome (94149).

The spelling of 93721428 in words is "ninety-three million, seven hundred twenty-one thousand, four hundred twenty-eight".