28401512 has 8 divisors (see below), whose sum is σ = 53252850. Its totient is φ = 14200752.

The previous prime is 28401511. The next prime is 28401517. The reversal of 28401512 is 21510482.

It can be written as a sum of positive squares in only one way, i.e., 24661156 + 3740356 = 4966^2 + 1934^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×28401512² = 1613291767772288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28401511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1775087 + ... + 1775102.

Almost surely, 2^28401512 is an apocalyptic number.

It is an amenable number.

28401512 is a deficient number, since it is larger than the sum of its proper divisors (24851338).

28401512 is a wasteful number, since it uses less digits than its factorization.

28401512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3550195 (or 3550191 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 28401512 is about 5329.3068967737. The cubic root of 28401512 is about 305.1034747003.

Adding to 28401512 its reverse (21510482), we get a palindrome (49911994).

The spelling of 28401512 in words is "twenty-eight million, four hundred one thousand, five hundred twelve".