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BaseRepresentation
bin1001010111101…
…10011011110100
312110220111110000
410223312123310
5130110312040
611444431300
71643060145
oct453663364
9173814400
1078604020
1140408400
12223a8530
1313391b71
14a621acc
156d7a130
hex4af66f4

78604020 has 180 divisors, whose sum is σ = 271714212. Its totient is φ = 19008000.

The previous prime is 78603997. The next prime is 78604027. The reversal of 78604020 is 2040687.

It can be written as a sum of positive squares in 2 ways, for example, as 59629284 + 18974736 = 7722^2 + 4356^2 .

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78604027) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 195820 + ... + 196220.

Almost surely, 278604020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78604020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135857106).

78604020 is an abundant number, since it is smaller than the sum of its proper divisors (193110192).

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

78604020 is a wasteful number, since it uses less digits than its factorization.

78604020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 78604020 is about 8865.8908181863. The cubic root of 78604020 is about 428.3659271915.

The spelling of 78604020 in words is "seventy-eight million, six hundred four thousand, twenty".