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87404440 = 2355573923
BaseRepresentation
bin1010011010110…
…10111110011000
320002110121100111
411031122332120
5134333420230
612401214104
72110632304
oct515327630
9202417314
1087404440
1145379282
1225331334
1315153706
14b872d04
157a1792a
hex535af98

87404440 has 32 divisors (see below), whose sum is σ = 197063280. Its totient is φ = 34890112.

The previous prime is 87404437. The next prime is 87404441. The reversal of 87404440 is 4440478.

It is a super-2 number, since 2×874044402 = 15279072263427200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87404441) 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, 20319 + ... + 24241.

Almost surely, 287404440 is an apocalyptic number.

It is an amenable number.

87404440 is an abundant number, since it is smaller than the sum of its proper divisors (109658840).

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

87404440 is a wasteful number, since it uses less digits than its factorization.

87404440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4491 (or 4487 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 87404440 is about 9349.0341747156. The cubic root of 87404440 is about 443.7903265606.

The spelling of 87404440 in words is "eighty-seven million, four hundred four thousand, four hundred forty".

Divisors: 1 2 4 5 8 10 20 40 557 1114 2228 2785 3923 4456 5570 7846 11140 15692 19615 22280 31384 39230 78460 156920 2185111 4370222 8740444 10925555 17480888 21851110 43702220 87404440