28655722779840 has 224 divisors, whose sum is σ = 108867254919360. Its totient is φ = 7053716348928.

The previous prime is 28655722779833. The next prime is 28655722779973. The reversal of 28655722779840 is 4897722755682.

28655722779840 is a `hidden beast` number, since 2 + 8 + 6 + 5 + 572 + 2 + 7 + 7 + 9 + 8 + 40 = 666.

It is a super-2 number, since 2×28655722779840² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127450549 + ... + 127675188.

It is an arithmetic number, because the mean of its divisors is an integer number (486014530890).

Almost surely, 2^{28655722779840} is an apocalyptic number.

28655722779840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28655722779840 is an abundant number, since it is smaller than the sum of its proper divisors (80211532139520).

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

28655722779840 is a wasteful number, since it uses less digits than its factorization.

28655722779840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255125776 (or 255125760 counting only the distinct ones).

The product of its (nonzero) digits is 948326400, while the sum is 72.

The spelling of 28655722779840 in words is "twenty-eight trillion, six hundred fifty-five billion, seven hundred twenty-two million, seven hundred seventy-nine thousand, eight hundred forty".