28990351 has 8 divisors (see below), whose sum is σ = 32064704. Its totient is φ = 26036640.

The previous prime is 28990349. The next prime is 28990361. The reversal of 28990351 is 15309982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28990351 - 2¹ = 28990349 is a prime.

It is a super-2 number, since 2×28990351² = 1680880902206402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28990351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28990361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29655 + ... + 30616.

It is an arithmetic number, because the mean of its divisors is an integer number (4008088).

Almost surely, 2^28990351 is an apocalyptic number.

28990351 is a deficient number, since it is larger than the sum of its proper divisors (3074353).

28990351 is a wasteful number, since it uses less digits than its factorization.

28990351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60321.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 28990351 is about 5384.2688454422. The cubic root of 28990351 is about 307.1976043232.

The spelling of 28990351 in words is "twenty-eight million, nine hundred ninety thousand, three hundred fifty-one".