28637396 has 6 divisors (see below), whose sum is σ = 50115450. Its totient is φ = 14318696.

The previous prime is 28637387. The next prime is 28637423. The reversal of 28637396 is 69373682.

It can be written as a sum of positive squares in only one way, i.e., 25361296 + 3276100 = 5036^2 + 1810^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3579671 + ... + 3579678.

It is an arithmetic number, because the mean of its divisors is an integer number (8352575).

Almost surely, 2^28637396 is an apocalyptic number.

It is an amenable number.

28637396 is a deficient number, since it is larger than the sum of its proper divisors (21478054).

28637396 is a wasteful number, since it uses less digits than its factorization.

28637396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7159353 (or 7159351 counting only the distinct ones).

The product of its digits is 326592, while the sum is 44.

The square root of 28637396 is about 5351.3919684508. The cubic root of 28637396 is about 305.9458089634.

The spelling of 28637396 in words is "twenty-eight million, six hundred thirty-seven thousand, three hundred ninety-six".