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31371188840 = 2352743128591
BaseRepresentation
bin11101001101110111…
…100101101001101000
32222222022102111211222
4131031313211221220
51003222011020330
622224533241212
72160256463645
oct351567455150
988868374758
1031371188840
1112339244552
1260b6193208
132c5c496a44
1417385badcc
15c391cc0e5
hex74dde5a68

31371188840 has 32 divisors (see below), whose sum is σ = 70590216960. Its totient is φ = 12547579200.

The previous prime is 31371188801. The next prime is 31371188851. The reversal of 31371188840 is 4888117313.

It is a junction number, because it is equal to n+sod(n) for n = 31371188791 and 31371188800.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1082945 + ... + 1111535.

It is an arithmetic number, because the mean of its divisors is an integer number (2205944280).

Almost surely, 231371188840 is an apocalyptic number.

It is an amenable number.

31371188840 is an abundant number, since it is smaller than the sum of its proper divisors (39219028120).

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

31371188840 is a wasteful number, since it uses less digits than its factorization.

31371188840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56033 (or 56029 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 31371188840 in words is "thirty-one billion, three hundred seventy-one million, one hundred eighty-eight thousand, eight hundred forty".

Divisors: 1 2 4 5 8 10 20 40 27431 28591 54862 57182 109724 114364 137155 142955 219448 228728 274310 285910 548620 571820 1097240 1143640 784279721 1568559442 3137118884 3921398605 6274237768 7842797210 15685594420 31371188840