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87196421 = 1347142711
BaseRepresentation
bin1010011001010…
…00001100000101
320002002001000002
411030220030011
5134310241141
612352531045
72106104654
oct514501405
9202061002
1087196421
1145246a64
1225250a85
13150acb20
14b81b19b
1579c5e9b
hex5328305

87196421 has 8 divisors (see below), whose sum is σ = 95902464. Its totient is φ = 78775920.

The previous prime is 87196409. The next prime is 87196423. The reversal of 87196421 is 12469178.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-87196421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87196423) 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, 70745 + ... + 71966.

It is an arithmetic number, because the mean of its divisors is an integer number (11987808).

Almost surely, 287196421 is an apocalyptic number.

It is an amenable number.

87196421 is a deficient number, since it is larger than the sum of its proper divisors (8706043).

87196421 is a wasteful number, since it uses less digits than its factorization.

87196421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142771.

The product of its digits is 24192, while the sum is 38.

The square root of 87196421 is about 9337.9023875815. The cubic root of 87196421 is about 443.4379792669.

The spelling of 87196421 in words is "eighty-seven million, one hundred ninety-six thousand, four hundred twenty-one".

Divisors: 1 13 47 611 142711 1855243 6707417 87196421