28401776 has 20 divisors (see below), whose sum is σ = 59261832. Its totient is φ = 13108416.

The previous prime is 28401767. The next prime is 28401823. The reversal of 28401776 is 67710482.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68066 + ... + 68481.

Almost surely, 2^28401776 is an apocalyptic number.

28401776 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28401776 is an abundant number, since it is smaller than the sum of its proper divisors (30860056).

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

28401776 is a wasteful number, since it uses less digits than its factorization.

28401776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136568 (or 136562 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 28401776 is about 5329.3316654155. The cubic root of 28401776 is about 305.1044200380.

The spelling of 28401776 in words is "twenty-eight million, four hundred one thousand, seven hundred seventy-six".