72421828 has 24 divisors (see below), whose sum is σ = 132500480. Its totient is φ = 34594560.

The previous prime is 72421801. The next prime is 72421831. The reversal of 72421828 is 82812427.

It is a junction number, because it is equal to n+sod(n) for n = 72421793 and 72421802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6100 + ... + 13492.

Almost surely, 2^72421828 is an apocalyptic number.

It is an amenable number.

72421828 is a deficient number, since it is larger than the sum of its proper divisors (60078652).

72421828 is a wasteful number, since it uses less digits than its factorization.

72421828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7507 (or 7505 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 72421828 is about 8510.1015270089. The cubic root of 72421828 is about 416.8276253513.

The spelling of 72421828 in words is "seventy-two million, four hundred twenty-one thousand, eight hundred twenty-eight".