28778370 has 16 divisors (see below), whose sum is σ = 69068160. Its totient is φ = 7674224.

The previous prime is 28778329. The next prime is 28778381. The reversal of 28778370 is 7387782.

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, 479610 + ... + 479669.

It is an arithmetic number, because the mean of its divisors is an integer number (4316760).

Almost surely, 2^28778370 is an apocalyptic number.

28778370 is an abundant number, since it is smaller than the sum of its proper divisors (40289790).

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

28778370 is a wasteful number, since it uses less digits than its factorization.

28778370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959289.

The product of its (nonzero) digits is 131712, while the sum is 42.

The square root of 28778370 is about 5364.5475112073. The cubic root of 28778370 is about 306.4470163633.

The spelling of 28778370 in words is "twenty-eight million, seven hundred seventy-eight thousand, three hundred seventy".