28077330 has 32 divisors (see below), whose sum is σ = 68822784. Its totient is φ = 7327616.

The previous prime is 28077277. The next prime is 28077331. The reversal of 28077330 is 3377082.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (28077331) 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, 8547 + ... + 11366.

It is an arithmetic number, because the mean of its divisors is an integer number (2150712).

Almost surely, 2^28077330 is an apocalyptic number.

28077330 is an abundant number, since it is smaller than the sum of its proper divisors (40745454).

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

28077330 is a wasteful number, since it uses less digits than its factorization.

28077330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19970.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 28077330 is about 5298.8045821676. The cubic root of 28077330 is about 303.9381871669.

The spelling of 28077330 in words is "twenty-eight million, seventy-seven thousand, three hundred thirty".